(19)
(11)EP 3 288 241 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
24.03.2021 Bulletin 2021/12

(21)Application number: 17174717.3

(22)Date of filing:  07.06.2017
(51)Int. Cl.: 
H04L 29/08  (2006.01)
H04W 4/00  (2018.01)
H04L 29/06  (2006.01)

(54)

MEDIUM STORING DATA CONVERSION PROGRAM, DATA CONVERSION DEVICE, AND DATA CONVERSION METHOD

MEDIUM ZUM SPEICHERN EINES DATENUMWANDLUNGSPROGRAMMS, DATENUMWANDLUNGSVORRICHTUNG UND VERFAHREN ZUR DATENUMWANDLUNG

SUPPORT D'INFORMATIONS MÉMORISANT UN PROGRAMME DE CONVERSION DE DONNÉES, DISPOSITIF DE CONVERSION DE DONNÉES ET PROCÉDÉ DE CONVERSION DE DONNÉES


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 24.08.2016 JP 2016163882

(43)Date of publication of application:
28.02.2018 Bulletin 2018/09

(73)Proprietor: Fujitsu Limited
Kawasaki-shi, Kanagawa 211-8588 (JP)

(72)Inventor:
  • Sakai, Takafumi
    Kanagawa 211-8588 (JP)

(74)Representative: Hoffmann Eitle 
Patent- und Rechtsanwälte PartmbB Arabellastraße 30
81925 München
81925 München (DE)


(56)References cited: : 
US-A1- 2015 163 053
  
  • HAYOUNI HAYTHEM ET AL: "A Survey on Encryption Schemes in Wireless Sensor Networks", 2014 7TH INTERNATIONAL CONFERENCE ON ADVANCED SOFTWARE ENGINEERING AND ITS APPLICATIONS, IEEE, 20 December 2014 (2014-12-20), pages 39-43, XP032730041, DOI: 10.1109/ASEA.2014.14 ISBN: 978-1-4799-7760-4 [retrieved on 2015-01-26]
  
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description

FIELD



[0001] The embodiment discussed herein is related to a medium storing a data conversion program, a data conversion device, and a data conversion method.

BACKGROUND



[0002] For example, a provider that provides users with services (hereinafter simply referred to as a provider as well) constructs and operates a job system (hereinafter referred to as information processing system as well) corresponding to applications in order to provide the users with various services. Specifically, the provider constructs an information processing system functioning as the Internet of things (IoT) system in order to, for example, analyze various data in a data center (temperature, humidity, and the like in the data center).

[0003] Such an information processing system includes, for example, a plurality of sensors (hereinafter referred to as sensor devices as well) that measure various data in the data center and a device (hereinafter referred to as information collection device as well) that collects and accumulates the data transmitted from the sensor devices. The information processing system as described above includes a device (hereinafter referred to as information analysis device as well) that acquires data accumulated in the information collection device and analyzes the acquired data.

[0004] The sensor devices included in the information processing system encrypt data to be transmitted (the data encrypted by the sensor devices is hereinafter referred to as encrypted data as well) when the sensor devices transmit data to the information collection device. When the information collection device included in the information processing system receives the encrypted data transmitted from the sensor devices, the information collection device decrypts the encrypted data and accumulates the decrypted data in a storing section. Consequently, the provider is capable of securing security of the data transmitted from the sensor devices to the information collection device (see, for example, Japanese Laid-open Patent Publication Nos. 2008-160520, 2008-124824, and 2000-138916).

[0005] Further background is provided in US 2015/0163053 A1, which discloses a relay apparatus that includes: a memory; and one or more processors coupled to the memory and configured to: generate second encrypted data by performing a second encryption process using a second key shared with a providing destination apparatus in a second network on first encrypted data which is generated by a node apparatus in a first network performing a first encryption process using a first key on data, generate decrypted data by performing a decryption process using the first key on the second encrypted data, and transmit the decrypted data to the providing destination apparatus.

[0006] When the sensor devices encrypt data to be transmitted to the information collection device, for example, every time the sensor devices transmit the encrypted data to the information collection device, the sensor devices transmit information for decrypting the encrypted data (the information hereinafter simply referred to as keys as well). Specifically, for example, upon receipt of notification that the encrypted data are received, from the information collection device, the sensor devices transmit keys for decrypting the encrypted data received by the information collection device.

[0007] However, when a large number of encrypted data are transmitted by the sensor devices (the encrypted data are transmitted a large number of times), the number of keys to be transmitted to the information collection device increases. Accordingly, in the information processing system described above, communication cost for decrypting the encrypted data is sometimes enormous depending on, for example, the number of encrypted data transmitted by the sensor devices.

SUMMARY



[0008] The present invention provides a data conversion program as set out in each of claims 1 and 10, a data conversion device as set out in Claim 16, and a data conversion method as set out in Claim 17. Optional features are set out in the dependent claims.

BRIEF DESCRIPTION OF DRAWINGS



[0009] 

FIG. 1 is a diagram illustrating configuration of an information processing system;

FIG. 2 is a diagram describing a specific example of processing in the information processing system;

FIG. 3 is a diagram describing a specific example of the processing in the information processing system;

FIG. 4 is a diagram describing a specific example of the processing in the information processing system;

FIG. 5 is a diagram illustrating a hardware configuration of an information analysis device;

FIG. 6 is a diagram illustrating a hardware configuration of an information collection device;

FIG. 7 is a diagram illustrating a hardware configuration of a sensor device;

FIG. 8 is a functional block diagram of the information analysis device;

FIG. 9 is a functional block diagram of the information collection device;

FIG. 10 is a functional block diagram of the sensor device;

FIG. 11 is a flowchart describing an overview of data conversion processing according to an embodiment;

FIG. 12 is a flowchart describing information sharing processing in the embodiment;

FIG. 13 is a flowchart describing the information sharing processing in the embodiment;

FIG. 14 is a diagram describing the information sharing processing in the embodiment;

FIG. 15 is a flowchart describing the data conversion processing in the embodiment;

FIG. 16 is a flowchart describing the data conversion processing in the embodiment;

FIG. 17 is a flowchart describing the data conversion processing in the embodiment;

FIG. 18 is a flowchart describing the data conversion processing in the embodiment;

FIG. 19 is a flowchart describing the data conversion processing in the embodiment;

FIG. 20 is a diagram describing the data conversion processing in the embodiment;

FIG. 21 is a diagram describing the data conversion processing in the embodiment;

FIG. 22 is a diagram describing a specific example of measurement data;

FIG. 23 is a diagram describing a case in which data set in "content" in the measurement data described in FIG. 22 are converted into numerical value data;

FIG. 24 is a diagram describing a case in which a specific value is subtracted from the numerical value data set in the "content" in the measurement data described in FIG. 23; and

FIG. 25 is a diagram describing a case in which a plurality of pieces of specific information are added respectively to encrypted data set in the "content" in the measurement data described with reference to FIG. 24.


DESCRIPTION OF EMBODIMENT


[Configuration of an information processing system]



[0010] FIG. 1 is a diagram illustrating configuration of an information processing system 10. The information processing system 10 illustrated in FIG. 1 includes, for example, an information analysis device 1 (may be referred to as an information processing device), an information collection device 2, and sensor devices 3a, 3b, and 3c (hereinafter collectively referred to as sensor devices 3 as well or may be referred to as information processing devices). Note that the information processing system 10 illustrated in FIG. 1 may include one, two, or more than three sensor devices 3.

[0011] The sensor devices 3 measure, for example, temperature or humidity in a data center or a factory. The sensor devices 3 measure, for example, operation states of devices (for example, power consumption and the number of revolutions of fans) provided in the data center or the like. The sensor devices 3 transmit results of the measurement to the information collection device 2.

[0012] The information collection device 2 is configured from, for example, a plurality of physical machines. The information collection device 2 collects and accumulates data transmitted from the respective sensor devices 3. Specifically, as illustrated in FIG. 1, the information collection device 2 stores data transmitted from the respective sensor devices 3 in a storage 230.

[0013] For example, when there is an input from a provider, the information analysis device 1 acquires a part of the data accumulated in the storage 230 of the information collection device 2. The information analysis device 1 analyzes the acquired data.

[Example of processing in the information processing system]



[0014] A specific example of processing in the information processing system 10 is described. FIGs. 2 to 4 are diagrams describing the specific example of the processing in the information processing system 10.

[0015] For example, when the sensor device 3 (in the example illustrated in FIG. 2, the sensor device 3c) measures data in the data center, the sensor device 3 generates encrypted data (hereinafter referred to as encrypted data 231a) of the measured data (hereinafter may be referred to as measurement data 231). Thereafter, as illustrated in FIG. 2, the sensor device 3 transmits the generated encrypted data 231a to the information collection device 2 ((1) in FIG. 2).

[0016] On the other hand, for example, when the information collection device 2 receives the encrypted data 231a transmitted from the sensor device 3 ((2) in FIG. 2), the information collection device 2 transmits, to the sensor device 3, a transmission request for a key for decrypting the received encrypted data 231a ((3) in FIG. 3). When the sensor device 3 receives the transmission request for the key transmitted from the information collection device 2, the sensor device 3 transmits, to the information collection device 2, the key corresponding to the received transmission request ((4) in FIG. 3).

[0017] Thereafter, the information collection device 2 decrypts, with the key transmitted from the sensor device 3, the encrypted data 231a transmitted from the sensor device 3 ((5) in FIG. 3). The information collection device 2 stores the decrypted measurement data 231 in the storage 230 ((6) in FIG. 3).

[0018] Consequently, the information processing system 10 is capable of securing security of the measurement data 231 transmitted from the sensor device 3 to the information collection device 2.

[0019] When analyzing the measurement data 231, for example, the information analysis device 1 accesses the storage 230 and acquires the measurement data 231 stored in the storage 230 ((7) in FIG. 4). The information analysis device 1 analyzes the acquired measurement data 231 ((8) in FIG. 4).

[0020] Note that, for example, when the measurement data 231 is encrypted by the information collection device 2 and then stored in the storage 230, the information analysis device 1 may decrypt the acquired measurement data 231 and then analyzes the measurement data 231. When analyzing the measurement data 231, the information analysis device 1 may transmit a transmission request for the measurement data 231 to the information collection device 2 and receive the measurement data 231 transmitted by the information collection device 2.

[0021] When the encrypted data 231a is generated from the measurement data 231, for example, every time the sensor devices 3 transmit the encrypted data 231a to the information collection device 2, the sensor devices 3 have to transmit keys for decrypting the encrypted data 231a. However, the encrypted data 231a transmitted to the information collection device 2 by the sensor devices 3 may be sometimes as large as hundreds of millions of data depending on the size of the information processing system 10. Therefore, in such case, communication cost for decrypting the encrypted data 231a is enormous.

[0022] A provider that manages the information analysis device 1 and a provider that manages the sensor devices 3 (hereinafter referred to as the provider or the like that manages the information analysis device 1 as well) are sometimes different from a provider that manages the information collection device 2. In such case, the provider or the like that manages the information analysis device 1 is sometimes desirable to hide, from the provider that manages the information collection device 2, a method of decrypting the encrypted data 231a transmitted by the sensor devices 3.

[0023] Therefore, the information analysis device 1 in this embodiment shares in advance, with the sensor devices 3, information (hereinafter referred to as first information as well) designating any measurement data 231 among a series of plurality of measurement data 231 (hereinafter simply referred to as plurality of data as well). The information analysis device 1 in this embodiment shares in advance, with the sensor devices 3, information (hereinafter referred to as second information as well) designating the number of data when converting data formats of a series of plurality of data collectively for each predetermined number of data.

[0024] On the other hand, when a plurality of encrypted data 231a are transmitted from the sensor devices 3, the information collection device 2 directly stores the transmitted plurality of encrypted data 231a in the storage 230 without decrypting the encrypted data 231a.

[0025] When acquiring (receiving) a series of plurality of encrypted data 231a from the storage 230, the information analysis device 1 acquires, based on the first information and the second information, the predetermined number of the encrypted data 231a (hereinafter referred to as plurality of conversion target data as well), data formats of which have to be simultaneously converted. Specifically, the information analysis device 1 acquires, for example, according to content of the first information, a predetermined number of conversion target data corresponding to the number of data corresponding to the second information from the plurality of encrypted data 231a stored in the storage 230. Thereafter, the information analysis device 1 acquires a predetermined number of pieces of information (hereinafter referred to as predetermined number of pieces of specific information as well) included in the acquired respective predetermined number of conversion target data and converts data formats of the respective predetermined number of conversion target data by using the acquired predetermined number of pieces of specific information.

[0026] That is, since the information analysis device 1 and the sensor devices 3 share in advance information for decrypting the encrypted data 231a, the sensor devices 3 do not have to transmit keys with transmission of encrypted data to the information collection device 2. Therefore, the information processing system 10 is capable of suppressing communication cost involved in the decryption of the encrypted data 231a transmitted by the sensor devices 3.

[0027] The information collection device 2 stores the encrypted data 231a transmitted by the sensor device 3 in the storage 230 without decrypting the encrypted data 231a. The information analysis device 1 accesses the storage 230 and acquires data in an encrypted state (the encrypted data 231a). Consequently, even when the provider or the like that manages the information analysis device 1 and the provider that manages the information collection device 2 are different, the provider or the like that manages the information analysis device 1 is capable of hiding, from the provider that manages the information collection device 2, a method of decrypting encrypted data transmitted by the sensor devices 3.

[Hardware configuration of the information analysis device]



[0028] A hardware configuration of the information analysis device 1 is described. FIG. 5 is a diagram illustrating the hardware configuration of the information analysis device 1.

[0029] The information analysis device 1 includes a CPU 101, which is a processor, a memory 102, an external interface (an I/O unit) 103, and a storage medium 104. Such sections are connected to one another via a bus 105.

[0030] The storage medium 104 stores, for example, in a program storage region (not illustrated in FIG. 5) in the storage medium 104, a computer program 110 for performing processing of converting a data format (hereinafter may be referred to as data conversion processing). The storage medium 104 includes, for example, an information storage region 130 (hereinafter may be referred to as storing section 130) in which information used when performing data conversion processing is stored.

[0031] As illustrated in FIG. 5, when executing the computer program 110, the CPU 101 loads the computer program 110 from the storage medium 104 to the memory 102 and performs the data conversion processing in cooperation with the computer program 110. The external interface 103 performs, for example, communication with the information collection device 2.

[Hardware configuration of the information collection apparatus]



[0032] A hardware configuration of the information collection device 2 is described. FIG. 6 is a diagram illustrating the hardware configuration of the information collection device 2.

[0033] The information collection device 2 includes a CPU 201, which is a processor, a memory 202, an external interface (an I/O unit) 203, and a storage medium 204. Such sections are connected to one another via a bus 205.

[0034] The storage medium 204 stores, for example, in a program storage region (not illustrated in FIG. 6) in the storage medium 204, a computer program 210 for performing the data conversion processing. The storage medium 204 includes, for example, an information storage region 230 (hereinafter may be referred to as storing section 230) in which information used in performing the data conversion processing is stored. Note that the storage 230 described with reference to FIG. 1 and the like corresponds to the information storage region 230.

[0035] As illustrated in FIG. 6, when executing the computer program 210, the CPU 201 loads the computer program 210 from the storage medium 204 to the memory 202 and performs the data conversion processing in cooperation with the computer program 210.

[0036] For example, the external interface 203 performs communication with the information analysis device 1. For example, the external interface 203 performs communication with the sensor devices 3 via a network NW.

[Hardware configuration of the sensor device]



[0037] A hardware configuration of the sensor device 3 is described. FIG. 7 is a diagram illustrating the hardware configuration of the sensor device 3.

[0038] The sensor device 3 includes a CPU 301, which is a processor, a memory 302, an external interface (an I/O unit) 303, and a storage medium 304. Such sections are connected to one another via a bus 305.

[0039] The storage medium 304 stores, for example, in a program storage region (not illustrated in FIG. 7) in the storage medium 304, a computer program 310 for performing data conversion processing. The storage medium 304 includes, for example, an information storage region 330 (hereinafter referred to as storing section 330 as well) in which information used in performing the data conversion processing is stored.

[0040] As illustrated in FIG. 7, when executing the computer program 310, the CPU 301 loads the computer program 310 from the storage medium 304 to the memory 302 and performs the data conversion processing in cooperation with the computer program 310. For example, the external interface 303 performs communication with the information collection device 2 via the network NW.

[Functions of the information analysis device]



[0041] Functions of the information analysis device 1 are described. FIG. 8 is a functional block diagram of the information analysis device 1.

[0042] The CPU 101 of the information analysis device 1 cooperates with the computer program 110 to thereby operate as, for example, an information managing section 111, an information receiving section 112, an information acquiring section 113, and a data converting section 114. In the information storage region 130, for example, first information 331 (hereinafter referred to as data group information 331 as well), second information 332 (hereinafter referred to as number of data information 332 as well), and position information 333 are stored.

[0043] The information managing section 111 stores, for example, the data group information 331, the number of data information 332, and the position information 333 transmitted from the sensor device 3 in the information storage region 130. Note that, when the sensor devices 3 transmit different pieces of data group information 331 or the like, for example, the information managing section 111 stores the data group information 331 or the like for each of the sensor devices 3.

[0044] The data group information 331 is information referred to when a predetermined number of conversion target data (hereinafter referred to as data group as well), data formats of which have to be simultaneously converted, are designated among the encrypted data 231a acquired from the information collection device 2. Specifically, the data group information 331 is, for example, information indicating that the encrypted data 231a is designated in descending order of times corresponding to the data (for example, acquisition times in the sensor devices 3). The number of data information 332 is information indicating the number of the encrypted data 231a included in the data group.

[0045] Further, the position information 333 is information designating positions where a plurality of pieces of specific information used when data formats are converted are respectively embedded in the respective encrypted data 231a acquired from the information storage region 230. Specifically, the position information 333 is, for example, information indicating positions of the heads of the data. The position information 333 is, for example, information designating last positions of the data. Specific examples of the data group information 331, the number of data information 332, and the position information 333 are described below.

[0046] The information receiving section 112 receives the data group information 331, the number of data information 332, and the position information 333 transmitted from the sensor device 3. The information receiving section 112 acquires (receives) the encrypted data 231a stored in the information storage region 230 of the information collection device 2.

[0047] The information acquiring section 113 acquires the data group information 331 and the number of data information 332 stored in the information storage region 130. The information acquiring section 113 acquires, based on the acquired data group information 331 and number of data information 332, from the encrypted data 231a received by the information receiving section 112, a plurality of conversion target data corresponding to the number of data indicated by the number of data information 332. Thereafter, the information acquiring section 113 acquires the position information 333 stored in the information storage region 130. The information acquiring section 113 acquires (extracts) a plurality of pieces of specific information respectively from positions indicated by the position information 333 in the acquired plurality of conversion target data. A specific example in which the information acquiring section 113 acquires the plurality of pieces of specific information is described below.

[0048] The data converting section 114 converts data formats of the plurality of conversion target data respectively using the plurality of pieces of specific information acquired by the information acquiring section 113. A specific example in which the data converting section 114 converts the data formats is described below.

[Functions of the information collection device]



[0049] Functions of the information collection device 2 are described. FIG. 9 is a functional block diagram of the information collection device 2.

[0050] The CPU 201 of the information collection device 2 cooperates with the computer program 210 to thereby operate as, for example, an information receiving section 211 and an information managing section 212. The encrypted data 231a transmitted from the sensor devices 3 are stored in the information storage region 230.

[0051] The information receiving section 211 receives the encrypted data 231a transmitted from the sensor devices 3. The information managing section 212 stores the encrypted data 231a received by the information receiving section 211 in the information storage region 230.

[Functions of the sensor device]



[0052] Functions of the sensor device 3 are described. FIG. 10 is a functional block diagram of the sensor device 3.

[0053] The CPU 301 of the sensor device 3 cooperates with the computer program 310 to thereby operate as, for example, an information managing section 311, an information acquiring section 312, a data converting section 313, and an information transmitting section 314. The data group information 331, the number of data information 332, and the position information 333 are stored in the information storage region 330.

[0054] For example, when the provider inputs the data group information 331, the number of data information 332, and the position information 333, the information managing section 311 stores the inputted information in the information storage region 330. Note that the information managing section 311 may store a plurality of measurement data 231 measured by the sensor device 3 in the information storage region 330.

[0055] The information acquiring section 312 acquires the data group information 331 and the number of data information 332 stored in the information storage region 330.

[0056] The data converting section 313 converts, for each of data groups including the measurement data 231 as many as the number indicated by the number of data information 332, by using specific values, which are keys for converting the measurement data 231 into the encrypted data 231a, data formats of the plurality of measurement data 231 measured by the sensor device 3 and generates a plurality of encrypted data 231a. For example, the specific values may be stored in advance in the information storage region 330 by the provider or may be changed under predetermined conditions or changed periodically.

[0057] The data converting section 313 adds, for each of the data groups including the encrypted data 231a as many as the number indicated by the number of data information 332, each of values (values indicated by a plurality of pieces of specific information), a sum of which is a specific value, to positions indicated by the position information 333 in the respective encrypted data 231a. That is, the data converting section 313 adds a plurality of pieces of specific information generated by dividing the specific value to the respective encrypted data 231a. Note that the specific information may be added to the encrypted data 231a one by one. However, two or more pieces of the specific information may also be added to each of the encrypted data 231a at a time. In that case, the position information has to indicate two or more positions.

[0058] The information transmitting section 314 transmits the encrypted data 231a generated by the data converting section 313 to the information collection device 2.

[0059] Note that the data group information 331, the number of data information 332, the position information 333, the specific value, and the like may be changed, for example, at predetermined timing. In this case, the sensor devices 3 and the information analysis device 1 have to share in advance the data group information 331 and the like and information indicating timing when the data group information 331 and the like are changed.

[Embodiment]



[0060] An embodiment is described. FIG. 11 is a flowchart describing an overview of data conversion processing in the embodiment.

[0061] The information analysis device 1 stays on standby until data reception timing (NO in S1). The data reception timing is, for example, timing when the information analysis device 1 receives the encrypted data 231a from the information storage region 230 of the information collection device 2, to analyze the measurement data 231 by the provider.

[0062] If the data reception timing comes (YES in S1), the information analysis device 1 acquires, from the information storage region 130, the data group information 331 designating any encrypted data 231a among the encrypted data 231a received in the processing in S1 (S2). In this case, the information analysis device 1 acquires, from the information storage region 130, the number of data information 332 designating the number of data, data formats of which are converted, among the encrypted data 231a received in the processing in S1 (S3).

[0063] That is, the provider stores information for decrypting the encrypted data 231a in the information storage region 130 in advance. In processing in S2 and S3, the information analysis device 1 accesses the information storage region 130 and acquires the data group information 331 and the number of data information 332.

[0064] Thereafter, the information analysis device 1 acquires, based on the data group information 331 and the number of data information 332 acquired in the processing in S2 and S3, a plurality of conversion target data corresponding to the number of data indicated by the number of data information 332 from the encrypted data 231a received in the processing in S1 (S4). Specifically, for example, the information analysis device 1 acquires, from the encrypted data 231a received in the processing in S1, as the plurality of conversion target data, the encrypted data 231a as many as the number indicated by the number of data information 332 in descending order of transmission time (time of transmission from the sensor device 3 to the information collection device 2).

[0065] Further, the information analysis device 1 acquires a plurality of pieces of specific information included respectively in the plurality of conversion target data acquired in the processing in S4 (S5). Specifically, the information analysis device 1 refers to the position information 333 stored in the information storage region 130 to thereby acquire a predetermined number of pieces of specific information included in the respective conversion target data.

[0066] The information analysis device 1 converts data formats of the respective predetermined number of conversion target data using the predetermined number of pieces of specific information acquired in the processing in S5 (S6). Specifically, the information analysis device 1 substitutes, for example, a sum of values indicated by the predetermined number of pieces of specific information acquired in the processing in S5 and values indicated by the respective predetermined number of conversion target data in an expression decided in advance to thereby convert the data format of the respective predetermined number of conversion target data.

[0067] That is, the information analysis device 1 shares in advance, with the sensor devices 3, information for decrypting the encrypted data 231a transmitted by the sensor devices 3. The information analysis device 1 refers to the information shared with the sensor devices 3 and performs decryption (a change of data formats) of the encrypted data 231a.

[0068] Consequently, the sensor devices 3 do not have to transmit keys, for example, every time the sensor devices 3 transmit encrypted data to the information collection device 2. Therefore, the information processing system 10 is capable of suppressing communication cost involved in the decryption of the encrypted data 231a transmitted by the sensor devices 3.

[Details of the embodiment]



[0069] Details of the data conversion processing in the embodiment are described. First, in the data conversion processing in the embodiment, processing of sharing the data group information 331 and the like (hereinafter referred to as information sharing processing as well) is described.

[Information sharing processing]



[0070] FIGs. 12 and 13 are flowcharts describing the information sharing processing in the embodiment. FIG. 14 is a diagram describing the information sharing processing in the embodiment. The information sharing processing illustrated in FIGs. 12 and 13 is described with reference to FIG. 14.

[0071] First, the information sharing processing in the sensor devices 3 is described. As illustrated in FIG. 12, the information managing sections 311 of the sensor devices 3 stay on standby, for example, until the data group information 331, the number of data information 332, and the position information 333 are inputted by the provider (NO in S101).

[0072] If the data group information 331 and the like is inputted (YES in S101), the information managing sections 311 of the sensor devices 3 respectively store the data group information 331, the number of data information 332, and the position information 333 inputted in the processing in S101 in the information storage regions 330 (S102). In this case, as illustrated in FIG. 14, the information transmitting sections 314 of the sensor devices 3 respectively transmit the data group information 331, the number of data information 332, and the position information 333 inputted in the processing in S101 to the information analysis device 1 (S103).

[0073] The information sharing processing in the information analysis device 1 is described. As illustrated in FIG. 13, the information receiving section 112 of the information analysis device 1 stays on standby until the information receiving section 112 receives the data group information 331, the number of data information 332, and the position information 333 from the sensor devices 3 (NO in S111).

[0074] If the information receiving section 112 of the information analysis device 1 receives the data group information 331 and the like (YES in S111), as illustrated in FIG. 14, the information managing section 111 of the information analysis device 1 stores the data group information 331, the number of data information 332, and the position information 333 received in the processing in S111 in the information storage region 130 (S112).

[0075] That is, the information analysis device 1 and the sensor devices 3 share information for decrypting the encrypted data 231a before the information analysis device 1 acquires the encrypted data 231a from the information collection device 2. Consequently, for example, every time the sensor devices 3 transmit the encrypted data 231a to the information collection device 2, the sensor devices 3 do not have to transmit keys corresponding to the encrypted data 231a. Therefore, the information processing system 10 is capable of suppressing communication cost involved in the decryption of the encrypted data 231a transmitted by the sensor devices 3.

[0076] Since the information for decrypting the encrypted data 231a is shared between the information analysis device 1 and the sensor devices 3, the sensor devices 3 are capable of transmitting the encrypted data 231a to the information collection device 2 in an encrypted state. Therefore, even if the provider or the like that manages the information analysis device 1 and the provider that manages the information collection device 2 are different, the provider or the like that manages the information analysis device 1 is capable of hiding, from the provider that manages the information collection device 2, a method of decrypting encrypted data transmitted by the sensor device 3.

[Details of the data conversion processing]



[0077] Details of the data conversion processing in the embodiment are described. FIGs. 15 to 19 are flowcharts describing the data conversion processing in the embodiment. FIGs. 20 to 25 are diagrams describing the data conversion processing in the embodiment. The data conversion processing illustrated in FIGs. 15 to 19 is described with reference to FIGs. 20 to 25.

[0078] First, the data conversion processing in the sensor device 3 is described. The information managing section 311 of the sensor device 3 stays on standby until data transmission timing comes (NO in S11). The data transmission timing may be timing when the sensor device 3 acquires the measurement data 231 (for example, temperature and the like in the data center). A specific example of the measurement data 231 is described below.

[Specific example of the measurement data]



[0079] FIG. 22 is a diagram describing a specific example of the measurement data 231. The measurement data 231 illustrated in FIG. 22 includes, as items, a "data ID" for identifying data included in the measurement data 231, a "sensor ID" for identifying the sensor device 3 that acquires the measurement data 231, and a "time stamp" indicating time when the measurement data 231 is acquired. The measurement data 231 illustrated in FIG. 22 includes, as an item, a "content" in which content of the measurement data 231 is set.

[0080] Specifically, the measurement data 231 illustrated in FIG. 22 indicates that, in the data, the "data ID" of which is "1", the "sensor ID" is "3c (the sensor device 3c)", the "time stamp" is "2016/07/25 14:00:00", and the "content" is "temperature: 23.5 (°C)". Concerning other data included in FIG. 22, explanation is omitted.

[0081] Referring back to FIG. 15, if the data transmission timing comes (YES in S11), the information acquiring section 312 of the sensor device 3 acquires the data group information 331, the number of data information 332, and the position information 333 stored in the information storage region 330 (S12). In this case, the information acquiring section 312 acquires a data group including the measurement data 231 the number of which is indicated by the number of data information 332, from the measurement data 231 measured in the processing in S11, according to content of the data group information 331 (S13).

[0082] The data converting section 313 of the sensor device 3 subtracts a specific value respectively from values indicated by the respective measurement data 231 included in the data group acquired in the processing in S13 to thereby convert data formats of the respective measurement data 231 included in the data group acquired in the processing in S13 and generate the encrypted data 231a (S14). The data converting section 313 may perform the processing in S14, for example, by referring to the specific values stored in the information storage region 330.

[0083] Specifically, for example, the data converting section 313 converts the data set in the "content" in the measurement data 231 described with reference to FIG. 22 into numerical value data and calculates numerical value data obtained by subtracting specific values from the converted numerical value data to thereby generate the encrypted data 231a from the measurement data 231. A specific example in generating the encrypted data 231a from the measurement data 231 is described.

[Specific example in generating the encrypted data 231a from the measurement data 231]



[0084] FIG. 23 is a diagram describing a case in which the data set in the "content" in the measurement data 231 described with reference to FIG. 22 are converted into numerical value data.

[0085] As illustrated in FIG. 23, the data converting section 313 converts, for example, according to a conversion rule decided in advance, the data set in the "content" in the measurement data described with reference to FIG. 22 into numerical value data. Specifically, for example, as illustrated in FIG. 23, the data converting section 313 sets, in the "content" of the data, the "data ID" of which is "1", in the measurement data 231, "00234521", which is numerical value data obtained by converting "temperature: 23.5 (°C)" set in the "content" of the data, the "data ID" of which is "1", in the measurement data 231 described with reference to FIG. 22. Explanation is omitted concerning the other data included in FIG. 23.

[0086] Subsequently, the data converting section 313 subtracts a specific value from the numerical value data set in the "content" in the measurement data 231 described with reference to FIG. 23. FIG. 24 is a diagram describing a case in which the specific value is subtracted from the numerical value data set in the "content" in the measurement data 231 described with reference to FIG. 23. In the following explanation, it is assumed that the specific value is "5".

[0087] For example, the data converting section 313 sets "00234516", which is numerical value data obtained by subtracting "5" from "00234521", in the "content" of the data, the "data ID" of which is "1", in the measurement data 231 illustrated in FIG. 24. Consequently, the data converting section 313 is capable of encrypting the data set in the "content" in the measurement data 231 described with reference to FIG. 22. Explanation is omitted concerning the other data included in FIG. 24.

[0088] Referring back to FIG. 16, the data converting section 313 adds a plurality of pieces of specific information, which are a plurality of values, a sum of which is a specific value, respectively to positions indicated by the position information 333 in the respective encrypted data 231a, the data formats of which have been converted in the processing in S14 (S15). In the following explanation, it is assumed that the data group information 331 is information indicating that the respective measurement data 231 are designated in descending order of times indicated by the time stamp. It is assumed that the number indicated by the number of data information 332 is "3".

[0089] Specifically, in the "time stamp" of the data in the encrypted data 231a described with reference to FIG. 24, earlier time is set as a value indicated by the "data ID" is smaller. Therefore, in this case, the data converting section 313 determines that the encrypted data 231a, the "data ID" of which is "1", "2", and "3", among the data included in the encrypted data 231a described with reference to FIG. 24 are included in the same data group. Furthermore, the data converting section 313 determines that the encrypted data 231a, the "data ID" of which is "4", "5", and "6", among the data included in the encrypted data 231a described with reference to FIG. 24 are included in the same data group.

[0090] In the following explanation, a plurality of pieces of specific information are added to the numerical data set in the "content" in the encrypted data 231a described with reference to FIG. 24. FIG. 25 is a diagram describing a case in which a plurality of pieces of specific information are added to the numerical value data set in the "content" in the encrypted data 231a described with reference to FIG. 24. Note that, in the following explanation, it is assumed that the position information 333 indicates positions of heads of the data.

[0091] For example, as illustrated in FIG. 25, the data converting section 313 adds, for example, "2", "1", and "2", which are a plurality of pieces of specific information divided from "5", which is a specific value, respectively to heads of data set in the "content" of the data, the "data ID" of which is "1", "2", and "3". For example, as illustrated in FIG. 25, the data converting section 313 adds, for example, "2", "3", and "0", which are a plurality of pieces of specific information divided from "5", which is the specific value, respectively to heads of data set in the "content" of the data, the "data ID" of which is "4", "5", and "6". Note that a way of dividing the specific value may be determined randomly, or may conform to a fixed rule, and the rule may be changed according to a predetermined condition or periodically. Bit positions in which the divided specific information is added (inserted) are not limited to the heads of the data and may be ends of the data or any bit positions. The position information 333 indicating the positions may be changed according to a predetermined condition or periodically.

[0092] That is, the data converting section 313 generates the encrypted data 231a from the measurement data 231 using only the data group information 331, the number of data information 332, and the position information 333 shared in advance with the information analysis device 1 in the information sharing processing. Consequently, as described below, the information analysis device 1 is capable of decrypting the encrypted data 231a by using only the information shared with the sensor devices 3 in advance.

[0093] Referring back to FIG. 16, the information transmitting section 314 of the sensor device 3 transmits the respective encrypted data 231a added with the plurality of pieces of specific information in the processing in S15 to the information collection device 2 (S16).

[0094] If the encryption and the transmission to the information collection device 2 are not performed for all of the measurement data 231 measured in the processing in S11 (YES in S17), the information acquiring section 312 performs the processing in S13 and subsequent steps again. On the other hand, if the encryption and the transmission to the information collection device 2 are performed concerning all of the measurement data 231 measured in the processing in S11 (NO in S17), the information acquiring section 312 stays on standby until the next data transmission timing (S11).

[0095] The data conversion processing in the information collection device 2 is described. As illustrated in FIG. 17, the information receiving section 211 of the information collection device 2 stays on standby until the information receiving section 211 receives the encrypted data 231a from the sensor devices 3 (NO in S21). If the information receiving section 211 receives the encrypted data 231a from the sensor devices 3 (YES in S21), as illustrated in FIG. 20, the information managing section 212 of the information collection device 2 stores the encrypted data 231a received in the processing in S21 in the information storage region 230 (S22).

[0096] That is, the information managing section 212 stores the encrypted data 231a transmitted by the sensor device 3 in the information storage region 230 without decrypting the encrypted data 231a. Consequently, even when the provider or the like that manages the information analysis device 1 and the provider that manages the information collection device 2 are different, the provider or the like that manages the information analysis device 1 is capable of hiding, from the provider that manages the information collection device 2, a method of decrypting encrypted data transmitted by the sensor device 3.

[0097] The data conversion processing in the information analysis device 1 is described. As illustrated in FIG. 18, the information receiving section 112 of the information analysis device 1 stays on standby until data analysis timing (NO in S31). The data analysis timing may be, for example, timing when the provider inputs, to the information analysis device 1, indication that the provider starts an analysis of the measurement data 231.

[0098] If the data analysis timing comes (YES in S31), as illustrated in FIG. 21, the information receiving section 112 acquires the encrypted data 231a from the information storage region 230 of the information collection device 2 (S32). Note that the information receiving section 112 may acquire only data that has to be analyzed among the encrypted data 231a stored in the information storage region 230.

[0099] Thereafter, the information acquiring section 113 refers to the information storage region 130 and acquires the data group information 331, the number of data information 332, and the position information 333 corresponding to the sensor device 3 that generates the encrypted data 231a acquired in the processing in S32 (S33). That is, information such as the data group information 331 that the information analysis device 1 shares with the sensor devices 3 is sometimes different for each of the sensor devices 3. Therefore, the information acquiring section 113 refers to, for example, information set in the "sensor ID" of the encrypted data 231a acquired in the processing in S32 and acquires information concerning the sensor device 3 that generates the encrypted data 231a.

[0100] Subsequently, the data converting section 114 acquires, according to the data group information 331 acquired in the processing in S33, from the encrypted data 231a acquired in the processing in S32, a data group including the encrypted data 231a corresponding to the number of data indicated by the number of data information 332 acquired in the processing in S33 (S34).

[0101] Specifically, the data converting section 114 determines that, among the data included in the encrypted data 231a described with reference to FIG. 25, data set in the "time stamp" at the earliest time (data, the "data ID" of which is "1", "2", and "3") are data included in the same data group. The data converting section 114 determines that, among the data included in the encrypted data 231a described in FIG. 25, three data set in the "time stamp" at the second earliest time (data, the "data ID" of which is "4", "5", and "6") are data included in the same data group. Therefore, the data converting section 114 acquires, from the data included in the encrypted data 231a described with reference to FIG. 25, the data group including the data, the "data ID" of which is "1", "2", and "3", and the data group including the data, the "data ID" of which is "4", "5", and "6".

[0102] The sensor devices 3 and the information analysis device 1 may share in advance, among the encrypted data 231a generated by the sensor devices 3, information indicating data serving as a start point in decrypting the encrypted data 231a (hereinafter referred to as start point information as well). The start point information may be, for example, time set in the "time stamp" of the data serving as the start point. In the processing in S34, the data converting section 114 may acquire a data group starting from the data indicated by the start point information.

[0103] Specifically, when time indicated by the start point information is "2016/07/25 14:01:00", the data converting section 114 determines that, among the encrypted data 231a described with reference to FIG. 25, information, the "data ID" of which is "3", is the start point. In this case, the data converting section 114 determines that data, the "data ID" of which is "3", "4", and "5", are data included in the same data group.

[0104] Thereafter, the data converting section 114 acquires a plurality of pieces of specific information from respective positions indicated by the position information 333 in the respective encrypted data 231a included in the data group acquired in the processing in S34 (S35).

[0105] Specifically, the data converting section 114 acquires, as the plurality of pieces of specific information, for example, "2", "1", and "2", which are values of heads of data set in the "content" of the data, the "data ID" of which is "1", "2", and "3", in the encrypted data 231a described with reference to FIG. 25. The data converting section 114 acquires, as the plurality of pieces of specific information, for example, "2", "3", and "0", which are values of heads of data set in the "content" of data, the "data ID" of which is "4", "5", and "6", in the encrypted data 231a described with reference to FIG. 25.

[0106] Further, as illustrated in FIG. 19, the data converting section 114 calculates a specific value, which is a sum of values indicated respectively by the plurality of pieces of specific information acquired in the processing in S35 (S36). The data converting section 114 adds the specific value calculated in the processing in S36 respectively to the values indicated by the encrypted data 231a included in the data group acquired in the processing in S34 to thereby convert the respective data formats of the encrypted data 231a included in the data group acquired in the processing in S14 and generate the measurement data 231 (S37).

[0107] Specifically, the data converting section 114 calculates "5", which is a sum of "2", "1", and "2", which are a plurality of pieces of specific information corresponding to the data, the "data ID" of which are "1", "2", and "3", in the encrypted data 231a described with reference to FIG. 25. The data converting section 114 deletes values added to heads of data set in the "content" in the data, the "data ID" of which is "1", "2", and "3". That is, the data converting section 114 generates data same as the data, the "data ID" of which is "1", "2", and "3", in the encrypted data 231a described with reference to FIG. 24. Thereafter, the data converting section 114 adds "5" to the values indicated by the data set in the "content" in the data, the "data ID" of which is "1", "2", and "3". That is, the data converting section 114 generates data same as the data, the "data ID" of which is "1", "2", and "3", in the measurement data 231 described with reference to FIG. 23.

[0108] Similarly, the data converting section 114 calculates "5", which is a sum of "2", "3", and "0", which are a plurality of pieces of specific information corresponding to the data, the "data ID" of which are "4", "5", and "6", in the encrypted data 231a described with reference to FIG. 25. The data converting section 114 deletes values added to heads of data set in the "content" in the data, the "data ID" of which is "4", "5", and "6". That is, the data converting section 114 generates data same as the data, the "data ID" of which is "4", "5", and "6", in the encrypted data 231a described with reference to FIG. 24. Thereafter, the data converting section 114 adds "5" to the values indicated by the data set in the "content" in the data, the "data ID" of which is "4", "5", and "6". That is, the data converting section 114 generates data same as the data, the "data ID" of which is "4", "5", and "6", in the measurement data 231 described with reference to FIG. 23.

[0109] Thereafter, the data converting section 114 converts numerical value data set in the "content" of the data into character data. That is, the data converting section 114 generates data same as the measurement data 231 described with reference to FIG. 22.

[0110] Referring back to FIG. 19, if not all of the encrypted data 231a acquired from the information storage region 230 of the information collection device 2 have been decrypted (NO in S38), the information acquiring section 113 performs the processing in S33 and subsequent steps again. On the other hand, if all of the encrypted data 231a acquired from the information storage region 230 of the information collection device 2 are decrypted (NO in S38), the information acquiring section 113 stays on standby until the next data analysis timing (S31).

[0111] In this way, the information analysis device 1 according to this embodiment shares in advance, with the sensor devices 3, for example, the data group information 331 designating any data among the plurality of measurement data 231. When the plurality of encrypted data 231a are transmitted from the sensor devices 3, the information collection device 2 directly stores the transmitted plurality of encrypted data 231a in the information storage region 230 without decrypting the encrypted data 231a.

[0112] When the information analysis device 1 acquires the plurality of encrypted data 231a from the information storage region 230, the information analysis device 1 acquires, based on the data group information 331 and the like, a plurality of conversion target data, data formats of which have to be simultaneously converted. Thereafter, the information analysis device 1 acquires a plurality of pieces of specific information included respectively in the acquired plurality of conversion target data and converts respective data formats of the plurality of conversion target data using the acquired plurality of pieces of specific information.

[0113] Consequently, the sensor devices 3 do not have to transmit keys upon transmission of encrypted data to the information collection device 2. Therefore, the information processing system 10 is capable of suppressing communication cost involved in the decryption of the encrypted data 231a transmitted by the sensor device 3.

[0114] The information collection device 2 stores the encrypted data 231a transmitted by the sensor device 3 in the storage 230 without decrypting the encrypted data 231a. The information analysis device 1 accesses the storage 230 and acquires data (the encrypted data 231a) in the encrypted state. Consequently, even when the provider or the like that manages the information analysis device 1 and the provider that manages the information collection device 2 are different, the provider or the like that manages the information analysis device 1 is capable of hiding, from the provider that manages the information collection device 2, a method of decrypting encrypted data transmitted by the sensor device 3.

[0115] That is, for example, when the sensor devices 3 measure various data in the data center, the measurement data 231 is sometimes data that has a value only when an enormous amount of data (for example, all data measured in one moth) are analyzed. In the case of such measurement data 231, if the sensor devices 3 generate the encrypted data 231a for each one of the measurement data 231 and then transmit the encrypted data 231a to the information collection device 2 and the like, this is sometimes determined as disadvantageous in terms of communication cost with respect to the value of the measurement data 231.

[0116] Therefore, the sensor devices 3 in this embodiment encrypt each of data groups of the measurement data 231. Consequently, the information processing system 10 is capable of suppressing communication cost for the encryption of the measurement data 231 compared with when the sensor devices 3 generate the encrypted data 231a for each one of the measurement data 231.

[0117] Further, when the number of the measurement data 231 included in the data groups (the number indicated by the number of data information 332) is sufficiently small with respect to a number that gives the value to the measurement data 231, even if encryption performed on one data group is decoded by a malicious person, the value of the measurement data 231 is not spoiled. Therefore, the sensor device 3 in this embodiment is capable of suppressing communication cost for the encryption of the measurement data 231 without causing possibility that the value of the measurement data 231 is spoiled.

[0118] The sensor devices 3 in this embodiment transmit the data group information 331 and the like to the information analysis device 1 in advance. Therefore, the provider that manages the sensor devices 3 is capable of selecting a scheme of encryption (intensity of encryption) for the measurement data 231 after taking into account importance of the measurement data 231, communication cost, and the like.

[0119] Note that, in the above explanation in this embodiment, the specific value is subtracted from the data on the transmission side and the specific value is added to the data on the reception side. However, conversely, the specific value may be added on the transmission side and subtracted on the reception side. Alternatively, instead of the addition and the subtraction, other arithmetical operations such as multiplication and division and logical operations such as EOR (Exclusive OR) may also be used.

[0120] Confidentiality is further improved if the first information, the second information, and the position information are changed periodically or according to a predetermined condition.


Claims

1. A data conversion program (110) which, when executed by a computer, causes the computer to execute a process comprising:

when receiving a plurality of data (231), acquiring first information (331) and second information (332) from a storage (130), the first information (331) designating any data among the received plurality of data (231), the second information (332) designating a predetermined number of data, data formats of which are collectively converted, among the received plurality of data (231); acquiring, based on the acquired first information (331) and the acquired second information (332), the predetermined number of conversion target data (231a) from the received plurality of data (231);

extracting a predetermined number of pieces of specific information embedded in each of the acquired predetermined number of conversion target data (231a);

calculating a specific value to be used as a key by combining the extracted pieces of specific information in a predetermined way; and

converting a data format of each of the predetermined number of conversion target data (231a) by using the calculated specific value as the key.


 
2. The data conversion program according to claim 1, wherein the process further comprises:

receiving the first information (331) and the second information (332) in advance, from an information processing device (1; 3) that transmits the plurality of data (231), before the acquiring the first information (331) and the second information (332); and

storing the received first information (331) and the received second information (332) in the storage (130).


 
3. The data conversion program according to claim 2, wherein
the first information (331) is information indicating that the plurality of data (231) are designated in descending order of times respectively corresponding to the respective data.
 
4. The data conversion program according to claim 3, wherein
the times corresponding to the respective data are times when the information processing device (1; 3) has acquired the respective data.
 
5. The data conversion program according to claim 2, wherein the process further comprises:

receiving, before the acquiring the first information (331) and the second information (332), from the information processing device (1; 3) that transmits the plurality of data, position information (333) designating positions where the specific information is embedded in each of the predetermined number of data; and

storing the received position information (333) in the storage (130), and wherein

in the extracting the predetermined number of pieces of the specific information, the position information (333) is acquired from the storage (130), and the respective predetermined number of pieces of the specific information are extracted from the positions indicated by the position information (333) in the respective predetermined number of conversion target data (231a).


 
6. The data conversion program according to claim 1, wherein
in the calculating, the specific value is a sum of respective values indicated by the extracted predetermined number of pieces of the specific information, and
in the converting, the data formats of the acquired plurality of data (231) are converted by respectively performing a predetermined operation using respective values indicated by the acquired predetermined number of conversion target data (231a) and the specific value.
 
7. The data conversion program according to claim 6, wherein the predetermined operation is addition or subtraction.
 
8. The data conversion program according to claim 1, wherein
in the acquiring the first information (331) and the second information (332), an information processing device (1; 3) that has transmitted the plurality of data (231) is specified, and the first information (331) and the second information (332) corresponding to the specified information processing device (1; 3) are acquired.
 
9. The data conversion program according to claim 1, wherein
the acquiring the predetermined number of conversion target data (231a), the extracting the predetermined number of pieces of the specific information, the calculating the specific value, and the converting are repeatedly performed until the data formats are converted for all of the received plurality of data (231).
 
10. A data conversion program which, when executed by a computer, causes the computer to execute a process, the process comprising:

acquiring first information (331) and second information (332) from a storage (330) the first information (331) designating any data among a plurality of data (231), the second information (332) designating a predetermined number of data, data formats of which are collectively converted, among the plurality of data (231);

acquiring, based on the acquired first information (331) and the acquired second information (332), the predetermined number of conversion target data from the plurality of data (231) to be transmitted;

converting a data format of each of the plurality of conversion target data by using a specific value as a key;

embedding a predetermined number of pieces of specific information, a specific combination of which is the specific value, respectively to the predetermined number of conversion target data (231a); and

transmitting each of the predetermined number of conversion target data (231a) embedded with each of the predetermined number of pieces of specific information to an information processing device.


 
11. The data conversion program according to claim 10, wherein the process further comprises
transmitting the first information (331) and the second information (332) to the information processing device (1; 3) before the transmitting the conversion target data (231a).
 
12. The data conversion program according to claim 10, wherein the process further comprises
before the embedding, acquiring, from the storage (130), position information (333) designating positions at where the predetermined number of pieces of specific information are embedded respectively in the predetermined number of conversion target data (231a), wherein
in the embedding, the pieces of specific information are embedded at the respective positions indicated by the position information (333) in the predetermined number of conversion target data (231a).
 
13. The data conversion program according to claim 12, wherein the process further comprises
transmitting the position information (333) to the information processing device before the transmitting the conversion target data (231a).
 
14. The data conversion program according to claim 10, wherein
in the converting, the respective data formats of the acquired plurality of conversion target data (231a) are converted by subtracting or adding the specific value respectively from or to values indicated by the acquired predetermined number of conversion target data (231a).
 
15. The data conversion program according to claim 10, wherein
the acquiring the predetermined number of conversion target data (231a), the converting, the adding, and the transmitting are repeatedly performed until all of the plurality of data (231) are transmitted.
 
16. A data conversion device comprising:

an information acquiring section configured to, when receiving a plurality of data (231), acquire first information (331) and second information (331) from a storage (130), the first information (331) designating any data among the plurality of data (231), the second information (332) designating a predetermined number of data, data formats of which are collectively converted among the plurality of data (231); and

a data converting section configured

to acquire, based on the acquired first information (331) and the acquired second information (332), the predetermined number of conversion target data (231a) from the received plurality of data (231),

to extract a predetermined number of pieces of specific information embedded in each of the

acquired predetermined number of conversion target data (231a), to calculate a specific value to be used as a key by combining the extracted pieces of specific information in a predetermined way, and

to convert the data format of each of the predetermined number of conversion target data (231a) by using the calculated specific value as the key.


 
17. A data conversion method performed by a computer, the method causing the computer to:

when the computer receives a plurality of data, acquire first information (331) and second information (332) from a storage (130), the first information (331) designating any data among the plurality of data (231), the second information (332) designating a predetermined number of data, data formats of which are collectively converted among the plurality of data (231);

acquire, based on the acquired first information (331) and the acquired second information (332), the predetermined number of conversion target data (231a) from the received plurality of data (231);

extract a predetermined number of pieces of specific information embedded in each of the acquired predetermined number of conversion target data (231a);

calculate a specific value to be used as a key by combining the extracted pieces of specific information in a predetermined way; and

convert the data format of each of the respective predetermined number of conversion target data (231a) by using the calculated specific value as the key.


 


Ansprüche

1. Datenkonversionsprogramm (110), das, wenn von einem Computer ausgeführt, den Computer veranlasst, einen Prozess auszuführen, umfassend:

wenn eine Vielzahl von Daten (231) empfangen wird, Erlangen erster Informationen (331) und zweiter Informationen (332) aus einem Speicher (130), wobei die ersten Informationen (331) Daten aus der empfangenen Vielzahl von Daten (231) bezeichnen, die zweiten Informationen (332) eine vorbestimmte Anzahl von Daten, deren Datenformate gemeinsam konvertiert werden, aus der empfangenen Vielzahl von Daten (231) bezeichnen;

Erlangen, basierend auf den erlangten ersten Informationen (331) und den erlangten zweiten Informationen (332), der vorbestimmten Anzahl von Konversionszieldaten (231a) aus der empfangenen Vielzahl von Daten (231);

Extrahieren einer vorbestimmten Anzahl spezifischer Informationen, die in jeder der erlangten vorbestimmten Anzahl von Konversionszieldaten (231a) eingebettet sind;

Berechnen eines spezifischen Werts, der als ein Schlüssel durch Kombinieren der extrahierten spezifischen Informationen in vorbestimmter Weise zu verwenden ist; und

Konvertieren eines Datenformats jeder der vorbestimmten Anzahl von Konversionszieldaten (231a) durch Verwenden des berechneten spezifischen Werts als den Schlüssel.


 
2. Datenkonversionsprogramm nach Anspruch 1, wobei der Prozess weiter umfasst:

Empfangen der ersten Informationen (331) und der zweiten Informationen (332) im Voraus von einer Informationsverarbeitungsvorrichtung (1; 3), die die Vielzahl von Daten (231) überträgt, bevor die ersten Informationen (331) und die zweiten Informationen (332) erlangt werden; und

Speichern der empfangenen ersten Informationen (331) und der empfangenen zweiten Informationen (332) im Speicher (130).


 
3. Datenkonversionsprogramm nach Anspruch 2, wobei
die ersten Informationen (331) Informationen sind, die angeben, dass die Vielzahl von Daten (231) in absteigender Reihenfolge von Zeiten, die jeweils den jeweiligen Daten entsprechen, bezeichnet sind.
 
4. Datenkonversionsprogramm nach Anspruch 3, wobei
die Zeiten, die den jeweiligen Daten entsprechen, Zeiten sind, zu welchen die Informationsverarbeitungsvorrichtung (1; 3) die jeweiligen Daten erlangt hat.
 
5. Datenkonversionsprogramm nach Anspruch 2, wobei der Prozess weiter umfasst:

Empfangen, vor dem Erlangen der ersten Informationen (331) und der zweiten Informationen (332), von der Informationsverarbeitungsvorrichtung (1; 3), die die Vielzahl von Daten überträgt, von Positionsinformationen (333), die Positionen bezeichnen, wo die spezifischen Informationen in jeder der vorbestimmten Anzahl von Daten eingebettet sind; und

Speichern der empfangenen Positionsinformationen (333) im Speicher (130), und wobei

beim Extrahieren der vorbestimmten Anzahl der spezifischen Informationen die Positionsinformationen (333) vom Speicher (130) erlangt werden und die jeweilige vorbestimmte Anzahl der spezifischen Informationen aus den Positionen, die durch die Positionsinformationen (333) angegeben sind, in der jeweiligen vorbestimmten Anzahl von Konversionszieldaten (231a) extrahiert wird.


 
6. Datenkonversionsprogramm nach Anspruch 1, wobei
beim Berechnen der spezifische Wert eine Summe von jeweiligen Werten ist, die durch die extrahierte vorbestimmte Anzahl der spezifischen Informationen angegeben ist, und
beim Konvertieren die Datenformate der erlangten Vielzahl von Daten (231) durch jeweils Durchführen einer vorbestimmten Operation unter Verwendung jeweiliger Werte konvertiert werden, die durch die erlangte vorbestimmte Anzahl von Konversionszieldaten (231a) und den spezifischen Wert angegeben sind.
 
7. Datenkonversionsprogramm nach Anspruch 6, wobei die vorbestimmte Operation Addition oder Subtraktion ist.
 
8. Datenkonversionsprogramm nach Anspruch 1, wobei
beim Erlangen der ersten Informationen (331) und der zweiten Informationen (332) eine Informationsverarbeitungsvorrichtung (1; 3), die die Vielzahl von Daten (231) übertragen hat, spezifiziert wird, und die ersten Informationen (331) und die zweiten Informationen (332) entsprechend der spezifizierten Informationsverarbeitungsvorrichtung (1; 3) erlangt werden.
 
9. Datenkonversionsprogramm nach Anspruch 1, wobei
das Erlangen der vorbestimmten Anzahl von Konversionszieldaten (231a), das Extrahieren der vorbestimmten Anzahl der spezifischen Informationen, das Berechnen des spezifischen Werts und das Konvertieren wiederholt durchgeführt werden, bis die Datenformate für alle der empfangenen Vielzahl von Daten (231) konvertiert sind.
 
10. Datenkonversionsprogramm, das, wenn von einem Computer ausgeführt, den Computer veranlasst, einen Prozess auszuführen, der Prozess umfassend:

Erlangen erster Informationen (331) und zweiter Informationen (332) aus einem Speicher (330), wobei die ersten Informationen (331) Daten aus einer Vielzahl von Daten (231) bezeichnen, die zweiten Informationen (332) eine vorbestimmte Anzahl von Daten, deren Datenformate gemeinsam konvertiert werden, aus der Vielzahl von Daten (231) bezeichnen;

Erlangen, basierend auf den erlangten ersten Informationen (331) und den erlangten zweiten Informationen (332), der vorbestimmten Anzahl von Konversionszieldaten aus der Vielzahl von Daten (231), die zu übertragen sind;

Konvertieren eines Datenformats jeder der Vielzahl von Konversionszieldaten durch Verwenden eines spezifischen Werts als einen Schlüssel;

Einbetten einer vorbestimmten Anzahl spezifischer Informationen, von welchen eine spezifische Kombination der spezifische Wert ist, jeweils in die vorbestimmte Anzahl von Konversionszieldaten (231a) und

Übertragen jeder der vorbestimmten Anzahl von Konversionszieldaten (231a), eingebettet mit jeder der vorbestimmten Anzahl spezifischer Informationen, an eine Informationsverarbeitungsvorrichtung.


 
11. Datenkonversionsprogramm nach Anspruch 10, wobei der Prozess weiter umfasst
Übertragen der ersten Informationen (331) und der zweiten Informationen (332) an die Informationsverarbeitungsvorrichtung (1; 3), bevor die Konversionszieldaten (231a) übertragen werden.
 
12. Datenkonversionsprogramm nach Anspruch 10, wobei der Prozess weiter umfasst
vor dem Einbetten, Erlangen, vom Speicher (130), von Positionsinformationen (333), die Positionen bezeichnen, wo die vorbestimmte Anzahl spezifischer Informationen jeweils in der vorbestimmten Anzahl von Konversionszieldaten (231a) eingebettet ist, wobei
beim Einbetten die spezifischen Informationen an den jeweiligen Positionen, die durch die Positionsinformationen (333) angegeben sind, in der vorbestimmten Anzahl von Konversionszieldaten (231a) eingebettet werden.
 
13. Datenkonversionsprogramm nach Anspruch 12, wobei der Prozess weiter umfasst
Übertragen der Positionsinformationen (333) an die Informationsverarbeitungsvorrichtung vor dem Übertragen der Konversionszieldaten (231a).
 
14. Datenkonversionsprogramm nach Anspruch 10, wobei
beim Konvertieren die jeweiligen Datenformate der erlangten Vielzahl von Konversionszieldaten (231a) durch Subtrahieren oder Addieren des spezifischen Werts jeweils von oder zu Werten konvertiert werden, die durch die erlangte vorbestimmte Anzahl von Konversionszieldaten (231a) angegeben sind.
 
15. Datenkonversionsprogramm nach Anspruch 10, wobei
das Erlangen der vorbestimmten Anzahl von Konversionszieldaten (231a), das Konvertieren, das Addieren und das Übertragen wiederholt durchgeführt werden, bis alle der Vielzahl von Daten (231) übertragen sind.
 
16. Datenkonversionsvorrichtung, umfassend:

einen Informationserlangungsabschnitt, der konfiguriert ist, wenn eine Vielzahl von Daten (231) empfangen wird, erste Informationen (331) und zweite Informationen (331) von einem Speicher (130) zu erlangen, wobei die ersten Informationen (331) Daten aus der Vielzahl von Daten (231) bezeichnen, die zweiten Informationen (332) eine vorbestimmte Anzahl von Daten, deren Datenformate gemeinsam konvertiert werden, aus der Vielzahl von Daten (231) bezeichnen; und

einen Datenkonvertierungsabschnitt, der konfiguriert ist

zum Erlangen, basierend auf den erlangten ersten Informationen (331) und den erlangten zweiten Informationen (332) der vorbestimmten Anzahl von Konversionszieldaten (231a) aus der empfangenen Vielzahl von Daten (231),

zum Extrahieren einer vorbestimmten Anzahl spezifischer Informationen, die in jeder der erlangten vorbestimmten Anzahl von Konversionszieldaten (231a) eingebettet sind,

zum Berechnen eines spezifischen Werts, der als ein Schlüssel durch Kombinieren der extrahierten spezifischen Informationen in einer vorbestimmten Weise zu verwenden ist, und

zum Konvertieren des Datenformats jeder der vorbestimmten Anzahl von Konversionszieldaten (231a) durch Verwenden des berechneten spezifischen Werts als den Schlüssel.


 
17. Datenkonversionsverfahren, das von einem Computer durchgeführt wird, wobei das Verfahren den Computer veranlasst zum:

wenn der Computer eine Vielzahl von Daten empfängt, Erlangen erster Informationen (331) und zweiter Informationen (332) von einem Speicher (130), wobei die ersten Informationen (331) Daten aus der Vielzahl von Daten (231) bezeichnen, die zweiten Informationen (332) eine vorbestimmte Anzahl von Daten, deren Datenformate gemeinsam konvertiert werden, aus der Vielzahl von Daten (231) bezeichnen;

Erlangen, basierend auf den erlangten ersten Informationen (331) und den erlangten zweiten Informationen (332) der vorbestimmten Anzahl von Konversionszieldaten (231a) aus der empfangenen Vielzahl von Daten (231);

Extrahieren einer vorbestimmten Anzahl spezifischer Informationen, die in jeder der erlangten vorbestimmten Anzahl von Konversionszieldaten (231a) eingebettet sind;

Berechnen eines spezifischen Werts, der als Schlüssel durch Kombinieren der extrahierten spezifischen Informationen in einer vorbestimmten Weise zu verwenden ist; und

Konvertieren des Datenformats jeder der vorbestimmten Anzahl von Konversionszieldaten (231a) durch Verwenden des berechneten spezifischen Werts als den Schlüssel.


 


Revendications

1. Programme de conversion de données (110) qui, quand il est exécuté par un ordinateur, amène l'ordinateur à exécuter un processus comprenant :

lors de la réception d'une pluralité de données (231), l'acquisition d'une première information (331) et d'une seconde information (332) à partir d'un dispositif de stockage (130), la première information (331) désignant n'importe quelle donnée parmi la pluralité reçue de données (231), la seconde information (332) désignant un nombre prédéterminé de données, dont des formats de données sont convertis collectivement, parmi la pluralité reçue de données (231) ;

l'acquisition, sur la base de la première information acquise (331) et de la seconde information acquise (332), du nombre prédéterminé de données cibles de conversion (231a) à partir de la pluralité reçue de données (231) ;

l'extraction d'un nombre prédéterminé d'éléments d'information spécifique intégrés dans chacune du nombre prédéterminé acquis de données cibles de conversion (231a) ;

le calcul d'une valeur spécifique à utiliser comme une clé en combinant les éléments extraits d'information spécifique d'une manière prédéterminée ; et

la conversion d'un format de données de chacune du nombre prédéterminé de données cibles de conversion (231a) en utilisant la valeur spécifique calculée comme la clé.


 
2. Programme de conversion de données selon la revendication 1, dans lequel le processus comprend en outre :

la réception de la première information (331) et de la seconde information (332) à l'avance, à partir d'un dispositif de traitement d'informations (1; 3) qui transmet la pluralité de données (231), avant l'acquisition de la première information (331) et de la seconde information (332) ; et

le stockage de la première information reçue (331) et de la seconde information reçue (332) dans le dispositif de stockage (130).


 
3. Programme de conversion de données selon la revendication 2, dans lequel
la première information (331) est une information indiquant que la pluralité de données (231) sont désignées par ordre décroissant de temps correspondant respectivement aux données respectives.
 
4. Programme de conversion de données selon la revendication 3, dans lequel
les temps correspondant aux données respectives sont des temps auxquels le dispositif de traitement d'informations (1 ; 3) a acquis les données respectives.
 
5. Programme de conversion de données selon la revendication 2, dans lequel le processus comprend en outre :

la réception, avant l'acquisition de la première information (331) et de la seconde information (332), à partir du dispositif de traitement d'informations (1 ; 3) qui transmet la pluralité de données, d'une information de position (333) désignant des positions où l'information spécifique est intégrée dans chacune du nombre prédéterminé de données ; et

le stockage de l'information de position reçue (333) dans le dispositif de stockage (130), et dans lequel

dans l'extraction du nombre prédéterminé d'éléments de l'information spécifique, l'information de position (333) est acquise à partir du dispositif de stockage (130) et le nombre prédéterminé respectif d'éléments de l'information spécifique est extrait à partir des positions indiquées par l'information de position (333) dans le nombre prédéterminé respectif de données cibles de conversion (231a).


 
6. Programme de conversion de données selon la revendication 1, dans lequel
dans le calcul, la valeur spécifique est une somme de valeurs respectives indiquées par le nombre prédéterminé extrait d'éléments de l'information spécifique, et
dans la conversion, les formats de données de la pluralité acquise de données (231) sont convertis en effectuant respectivement une opération prédéterminée en utilisant des valeurs respectives indiquées par le nombre prédéterminé acquis de données cibles de conversion (231a) et la valeur spécifique.
 
7. Programme de conversion de données selon la revendication 6, dans lequel l'opération prédéterminée est une addition ou une soustraction.
 
8. Programme de conversion de données selon la revendication 1, dans lequel
dans l'acquisition de la première information (331) et de la seconde information (332), un dispositif de traitement d'informations (1; 3) qui a transmis la pluralité de données (231) est spécifié, et la première information (331) et la seconde information (332) correspondant au dispositif de traitement d'informations (1; 3) spécifié sont acquises.
 
9. Programme de conversion de données selon la revendication 1, dans lequel
l'acquisition du nombre prédéterminé de données cibles de conversion (231a), l'extraction du nombre prédéterminé d'éléments de l'information spécifique, le calcul de la valeur spécifique et la conversion sont effectuées de manière répétée jusqu'à ce que les formats de données soient convertis pour la totalité de la pluralité reçue de données (231).
 
10. Programme de conversion de données qui, quand il est exécuté par un ordinateur, amène l'ordinateur à exécuter un processus, le processus comprenant :

l'acquisition d'une première information (331) et d'une seconde information (332) à partir d'un dispositif de stockage (330), la première information (331) désignant n'importe quelle donnée parmi la pluralité de données (231), la seconde information (332) désignant un nombre prédéterminé de données, dont des formats de données sont convertis collectivement, parmi la pluralité reçue de données (231) ;

l'acquisition, sur la base de la première information acquise (331) et de la seconde information acquise (332), du nombre prédéterminé de données cibles de conversion à partir de la pluralité de données (231) à transmettre ;

la conversion d'un format de données de chacune de la pluralité de données cibles de conversion en utilisant une valeur spécifique comme une clé ;

l'intégration d'un nombre prédéterminé d'éléments d'information spécifique, dont une combinaison spécifique est la valeur spécifique, respectivement au nombre prédéterminé de données cibles de conversion (231a) ; et

la transmission de chacune du nombre prédéterminé de données cibles de conversion (231a) intégrée avec chacun du nombre prédéterminé d'éléments d'information spécifique à un dispositif de traitement d'informations.


 
11. Programme de conversion de données selon la revendication 10, dans lequel le processus comprend en outre
la transmission de la première information (331) et de la seconde information (332) au dispositif de traitement d'informations (1 ; 3) avant la transmission des données cibles de conversion (231a).
 
12. Programme de conversion de données selon la revendication 10, dans lequel le processus comprend en outre
avant l'intégration, l'acquisition, à partir du dispositif de stockage (130), d'une information de position (333) désignant des positions où le nombre prédéterminé d'éléments d'information spécifique sont intégrés respectivement au nombre prédéterminé de données cibles de conversion (231a), dans lequel
dans l'intégration, les éléments d'information spécifique sont intégrés au niveau des positions respectives indiquées par l'information de position (333) dans le nombre prédéterminé de données cibles de conversion (231a).
 
13. Programme de conversion de données selon la revendication 12, dans lequel le processus comprend en outre
la transmission de l'information de position (333) au dispositif de traitement d'informations avant la transmission des données cibles de conversion (231a).
 
14. Programme de conversion de données selon la revendication 10, dans lequel
dans la conversion, les formats de données respectifs de la pluralité acquise de données cibles de conversion (231a) sont convertis par soustraction ou addition de la valeur spécifique respectivement de ou à des valeurs indiquées par le nombre prédéterminé acquis de données cibles de conversion (231a).
 
15. Programme de conversion de données selon la revendication 10, dans lequel
l'acquisition du nombre prédéterminé de données cibles de conversion (231a), la conversion, l'addition et la transmission sont effectuées de manière répétée jusqu'à ce que la totalité de la pluralité de données (231) soient transmises.
 
16. Dispositif de conversion de données comprenant :

une section d'acquisition d'informations configurée pour, lors de la réception d'une pluralité de données (231), acquérir une première information (331) et une seconde information (331) à partir d'un dispositif de stockage (130), la première information (331) désignant n'importe quelle donnée parmi la pluralité de données (231), la seconde information (332) désignant un nombre prédéterminé de données, dont des formats de données sont convertis collectivement parmi la pluralité de données (231) ; et

une section de conversion de données configurée pour

acquérir, sur la base de la première information acquise (331) et de la seconde information acquise (332), le nombre prédéterminé de données cibles de conversion (231a) à partir de la pluralité reçue de données (231),

extraire un nombre prédéterminé d'éléments d'information spécifique intégrés dans chacune du nombre prédéterminé acquis de données cibles de conversion (231a),

calculer une valeur spécifique à utiliser comme une clé en combinant les éléments extraits d'information spécifique d'une manière prédéterminée, et

convertir le format de données de chacune du nombre prédéterminé de données cibles de conversion (231a) en utilisant la valeur spécifique calculée comme la clé.


 
17. Procédé de conversion de données effectué par un ordinateur, le procédé amenant l'ordinateur à :

quand l'ordinateur reçoit une pluralité de données, acquérir une première information (331) et une seconde information (332) à partir d'un dispositif de stockage (130), la première information (331) désignant n'importe quelle donnée parmi la pluralité de données (231), la seconde information (332) désignant un nombre prédéterminé de données, dont des formats de données sont convertis collectivement parmi la pluralité de données (231) ;

acquérir, sur la base de la première information acquise (331) et de la seconde information acquise (332), le nombre prédéterminé de données cibles de conversion (231a) à partir de la pluralité reçue de données (231) ;

extraire un nombre prédéterminé d'éléments d'information spécifique intégrés dans chacune du nombre prédéterminé acquis de données cibles de conversion (231a) ;

calculer une valeur spécifique à utiliser comme une clé en combinant les éléments extraits d'information spécifique d'une manière prédéterminée ; et

convertir le format de données de chacune du nombre prédéterminé respectif de données cibles de conversion (231a) en utilisant la valeur spécifique calculée comme la clé.


 




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REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description