Field of invention
The present invention relates to a stand-alone module for controlling the usability of a device, and particularly for remotely controlling such a device. More specifically, the module may be connected to impede full operation of a processing unit of such a device.
An old problem related to any type of device of value, is the risk of losing the device by accident or by theft. It must often be acknowledged that a lost or stolen device will probably not be returned to its rightful owner as long as the device is fully usable and the identity of the owner is unknown. For articles of manufacture, which are configured to be communicatively connected to a network, such as computers and mobile phones, various suggestions have been made regarding means for overcoming this problem. Most existing protection and tracking solutions are built in as a preventive action that needs to be activated by the user in order to protect the device. Existing password based solutions will protect a device to some extent but can be overcome. Existing tracking solutions using accounts and connectivity are dependent on a lot of prerequisites in order to be operational and effective. Other prior solutions include the following disclosures.
describes a security module configured to authenticate a telecommunications network. The security module comprises a locking module for disabling usability of an application module, an unlocking module for re-enabling usability of the application module, and a control module for activating the unlocking module depending on received data that is assignable in an authenticated way to a specific telecommunications network (2).
relates to a method that incorporates storing, by a universal integrated circuit card (UICC) including at least one processor, a digital root certificate locking a communication device to a network provider, and disabling an activation of the communication device responsive to receiving an indication of a revocation of the stored digital root certificate from a certificate authority.
discloses a smartcard embedded or inaccessible within a cellular telecommunications device (eUICC), locked to a particular operator, while allowing the operator to be altered legitimately presents a challenge. A method is described using policy control tables, and by maintaining the policy control table, any operator subscription may be downloaded / activated on the smartcard but the device will be prevented from accessing the desired operator because that access would violate the lock rules.
shows a mobile communication device comprises a memory for storing a unique identifier of the device and a processor for determining the lock status of the device- If the processor determines that the device is unlocked, the device transmits to a server an authorization request to operate in the unlocked mode including the unique identifier of the device. The server compares the unique identifier to unique identifiers of devices stored in a database, each identifier associated with a lock status. The device receives from the server the lock status of the device and controls the operation of the device in dependence upon the determined lock status
provides a method and system for remote control of a smart card. The method comprises that: a smart card management platform receives a request of locking or unlocking a smart card from a subscriber and the smart card management platform performs interactive processing with a terminal side according to the request via a mobile network platform, so as to enable the terminal side to perform the locking or unlocking of the smart card.
discloses a method for selecting a specific provisioning profile from among a plurality of provisioning profiles and an apparatus using same. In a terminal to which an eUICC is mounted, the eUICC includes at least one provisioning profile wherein each of the one or more provisioning profile enables a user terminal to communicate with a subscriber management entity supporting at least one network provider. Accordingly, a specific provisioning profile can be selected from among the one or more provisioning profiles, and a network can be connected with a specific mobile communication provider using the selected provisioning profile.
describes a mobile communication apparatus that includes a remote lock and control function. After theft or loss of the apparatus, it is possible to remotely lock the apparatus by sending a lock command, e.g. an SMS message. The apparatus may also be controlled to upload information enabling the user to retrieve valuable information stored in the apparatus. The apparatus includes a control unit and registers for controlling the operations of the apparatus, including receiving messages. The apparatus further includes locking means capable of detecting codes in messages received and, responsive to detecting a lock code, sending a lock command to the control unit to render the mobile communication apparatus at least partially inoperable.
discloses a device reaction to a stated theft. Location detection is used and setting a low power, or power off, for any interface if the device is in an alert state. The settings can be changed locally or remotely, but only when the device is in unharmed mode.
Summary of the invention
The prior art has thus offered different solutions for protecting mobile terminals, configured to operate in a mobile communications network. However, many devices that are not communication terminals as such may indeed also be susceptible to misplacement or theft. The invention targets the general object of being able to control devices of value, which may include minimizing the risk of losing possession or control of such a device.
According to a first aspect, this is targeted by a module in accordance with claim 1.
In accordance with a second aspect the object is targeted by a method for controlling usability of a processing unit of a device by means of a module in accordance with claim 10.
Preferred embodiments are defined by the dependent claims.
Brief description of the drawings
Various embodiments of the invention will be described below with reference to the accompanying drawings, in which
Fig. 1 illustrates a module for controlling usability of a processing unit of a device according to one embodiment;
Fig. 2 schematically illustrates an access circuit and a secure element, formed on a common carrier according to one embodiment;
Fig. 3 schematically illustrate a flow chart for a process for operating the embodiment of Figs 1 and to according to one embodiment; and
Figs 4A and B illustrates the process of controlling usability of a device in an alert state.
Detailed description of preferred embodiments
In the following description, for purposes of explanation and not limitation, details are set forth herein related to various embodiments. In some instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The functions of the various elements including functional blocks, including but not limited to those labeled or described as "computer", "processor" or "controller", may be provided through the use of hardware such as circuit hardware and/or hardware capable of executing software in the form of coded instructions stored on computer readable medium. Thus, such functions and illustrated functional blocks are to be understood as being either hardware-implemented and/or computer-implemented, and are thus machine-implemented. In terms of hardware implementation, the functional blocks may include or encompass, without limitation, digital signal processor (DSP) hardware, reduced instruction set processor, hardware (e.g., digital or analog) circuitry including but not limited to application specific integrated circuit(s) [ASIC], and (where appropriate) state machines capable of performing such functions. In terms of computer implementation, a computer is generally understood to comprise one or more processors or one or more controllers, and the terms computer and processor and controller may be employed interchangeably herein. When provided by a computer or processor or controller, the functions may be provided by a single dedicated computer or processor or controller, by a single shared computer or processor or controller, or by a plurality of individual computers or processors or controllers, some of which may be shared or distributed. Moreover, use of the term "processor" or "controller" shall also be construed to refer to other hardware capable of performing such functions and/or executing software, such as the example hardware recited above.
Fig. 1 illustrates an embodiment of a module 10 for controlling usability of a device 1, which module 10 may be employed for any type of device 1 incorporating a processing unit 2, such as a central processing unit (CPU). The module 10 comprises a modem 11 for communicating with a cellular network, and an access circuit 12 connected to the modem 11 for cellular network authentication and access. The module may include or be connected to an antenna, for radio transmission with a cellular network 14, indicated in Fig. 1 by means of a base station. The access circuit comprises or is connected to a secure element 12, and the secure element 12 incorporates a state machine, effected by executable computer code. The state machine may be configured to control the device in accordance with one of a plurality of usability states, including at least two states. Those states include at least a normal state, which may mean a state in which normal operation of the processing unit 2 of the device 1 is allowed or supported. In addition, the plurality of states include an alert state, in which operation of the processing unit 2 is inhibited. The module 10 is autonomous and operates on its own, meaning that it is not dependent to any other entities, such as the processing unit 2, to become operational.
In one embodiment, the secure element includes a circuit which is non-detachably connected to the processing unit. The secure element circuit may be soldered to a common circuit board at the processing unit. In an alternative arrangement, the secure element circuit may be provided on a circuit card, which is non-detachably secured in a card reader, which card reader is mechanically connected to the processing unit.
According to the invention, the access circuit forms part of an Embedded Universal Integrated Circuit Card (eUICC) 12. Also the secure element preferably forms part of the eUICC 12.. In this respect, it may be noted that one and the same type of hardware circuit may e.g. be flashed to act as an UICC, or simply as an eSE, which may be decided by choice of implementation. In an alternative arrangement, a separate embedded secure element (eSE) may be employed, which has a secure element circuit that is separate from the eUICC. In another embodiment, in which such a separate eSE provides the secure element circuit, may be combined with a standard detachable Subscriber Identity Module (SIM) card, which provides the access circuit.
The embedded eUICC 12 is preferably compliant with a standard for provisioning over-the-air, and holds at least a security domain with cellular network access capabilities. The security domain, alternatively referred to as a root security domain, includes the necessary applications and the registers to manage and maintain the state of the module in terms of usability of a device 1, in other words a state machine. The range of states allowed is defined upon the choice of implementation. As a strict minimum, an alert and a normal state need to be defined. When the state machine of the eUICC is set in alert state the device 1 is not operable unless an alert is resolved and the device 1 goes back to the normal operation as under normal state, as defined by the implementation. The exact definition of operability may be defined through the choice of implementation, but an alert state shall mean that the device 1 cannot be used as intended and that the necessary measures have been implemented to avoid unauthorized change of state.
Fig. 2 schematically illustrates a combined access circuit and secure element in the form of an UICC 12. This UICC may e.g. be an eUICC, or e.g. a UICC that in other ways has been non-detachably connected to the modem 11, and in turn to the processing unit 2 of a device 1 under control. The eUICC comprises circuits and memory means configured to store program code forming eUICC operating software (OS) 121. The eUICC OS 121 is configured to implement alert management, integrated with domain management of the eUICC. For this purpose, the eUICC 12 comprises a root security domain 122. The embedded UICC shall not allow the root security domain 122 to be deleted but other security domains can be installed and activated in case the device integrates cellular connectivity in its primary definition, meaning that the device itself already includes a modem. In case of alert, the eUICC OS 121 must secure that the alert event is provided to the root security domain responsible for state control.
In accordance with a preferred embodiment, once an authenticated alert is received by the embedded UICC, the root security domain 122 will perceive the alert in order to perform usability control of the device 1 the module 10 is connected to. In one embodiment, the module always starts with the root security domain 122 and may switch to a user domain once the usability state, i.e. normal state, has been determined.
The module 1 is remotely accessible over the cellular network and the state of the eUICC is remotely controllable by an authenticated remote service. The authenticated remote service shall be allowed to query the state of the eUICC 12 and request a change of state.
The module is configured, according to the invention, to control the operability of the processing unit 2 of a device by controlling the enablement of a system clock of the processing unit 2. This control may be executed digitally by means of a data setting or signal connected to the processing unit 2. In an alternative embodiment, not being the invention, control may be executed by means of a signal switch, controlled by the module 10 to selectively allow or inhibit a signal or power to the processing unit 2. In case the module is in an alert state, operability of the processing unit is inhibited or completely disabled and the device cannot be started to become operable. In case an alert is received while the device is fully operational, the module is set in an alert state and shall shutdown immediately. Dependent on choice of implementation, the device 1 may be configured to perform tracking to send its position to the network and simply switch off, or it may enter a low power tracking mode to constantly report state and position to an authenticated remote service. In such an embodiment, the module 10 may include a positioning unit 13, e.g. a GPS receiver. Obtained position information, and potentially other information related to the device may, upon agreement, be forwarded to an authenticated owner or authorities.
Alerts can be triggered both from an authenticated service on the device itself or be broadcast from an authenticated remote service over the cellular network but can preferably only be resolved remotely. This allows the implementation of self-request mechanisms where the device itself requests a change of state. In such an embodiment, a state change request event may be self-triggered. It may e.g. be dependent on time, such as a self-lock timer or even be the default state at power up. Alternatively, or in combination, position of the device, as determined by positioning unit 13, may act as a trigger for the module 10 to go to alert mode. Alternatively, or in combination, the module 10 could be set in alert when manufactured and remotely unlocked when sold. In yet another alternative embodiment, an alert state may be ordered by default when the device is turned off, such that it is always started in alert state.
In a preferred embodiment, the module 10 is provided as a standalone chipset, comprising a modem 11 and an eUICC 12, and potentially a positioning unit 13. In one embodiment the standalone chipset may be supported on a common substrate 16, such as a PCB, as the processing unit 2. The module 10 and the processing unit 2 are then connected on the PCB 16 such that the module 10 is capable of inhibiting proper operation of the processing unit 2, by being able to disconnect access to a system clock signal.
Fig. 3 schematically shows a flow diagram representing an embodiment for control of a device 1 by means of a module 10 comprising a modem 11, an access circuit and a secure element, provided on an eUICC 12.
Power up 301 is typically initiated by a user, e.g. by pushing a button on the device 1 in question. When the device incorporates a module in accordance with the embodiments described herein, the first thing that occurs upon power up is that the module is booted 302, i.e. both the secure element 12, e.g. an eUICC, and the modem 11.
If the modem 11 is capable of going online, an online state control 303 is performed. This may be accomplished by actually transmitting a page signal to the cellular network in which the module 10 is set to operate, so as to trigger a state signal 304 to be sent back to the module 10. In an alternative embodiment, the module may simply be configured to listen to or measure a predetermined signal 304 or data value 304 in a signal, which is broadcast in the serving network, so as to determine whether or not there is any present state change request. The determination of whether a state change request event has occurred may require further steps. As an example, information received from the network may indicate a new location rule, and position data may thus have to be obtained from a positioning unit 13 in the module 10 before determining whether there is an actual state change event or not. In this step 303, access is typically also given to a pre-stored offline state value.
If a certain new state has been determined in stage 303, the state engine of the security domain is updated in 305, where after the module is restarted 306 and the module is again booted 302.
If, at the online state control stage 303 it is determined that there is no state change event, the state machine of the module 10 is configured to operate in accordance with its pre-stored offline data at 307. If the offline state is normal, the module will proceed to allow boot of the processing unit 2 of the device 1 at 308, after which operation of the device will continue uninhibited. If, on the other hand, the pre-stored offline state is set to alert, the module may be configured to go to a tracking mode 309, by operating a positioning unit 13. In one embodiment, this may include allowing the processing unit 2 to boot, and for the module 10 to collect positioning data in stealth mode, and reporting it to the network. In another embodiment, tracking mode 309 is entered without boot of the processing unit. The device 1 is thereby rendered useless, or at least with inhibited operation characteristics.
In the event that the module 10 is not capable of going online at boot 302, the module is configured to operate under offline state control 310. This entails checking state information stored in the root domain, and continuing accordingly. In one embodiment, the state machine is configured such that if it is impossible to connect to the network and go online, the module shall power down 311. In another embodiment, an actual pre-stored state may be recorded in the root domain, e.g. from the last time the module was powered up. In yet another embodiment, a pre-stored default value may be dependent on location as well, as already described.
If the offline state control results in the state being determined to be normal, the processing unit 2 is booted 308 and operation of the device 1 is allowed. If, on the other hand, it is determined that alert state is present, the module may be configured to power down 311.
When the processing unit has been booted 308 and the device 1 is operational, the module 10 will continue to monitor state change request events 304, either as received from the network, or occurring for other reasons, e.g. triggered by time and or position.
In case the device is set in alert mode offline, it shall preferably be possible to change the offline state after proper user authentication 312. This may e.g. be done wirelessly, e.g. by NFC if an NFC receiver is contained in the module 10 (not shown), through galvanic contact with a bus, or by input on a user interface, such as a touch screen.
Figs 4 illustrate an embodiment for the example of a module 10 for protecting full operability of a device 1 by radio control. This is obtained by means of the modem 11 and the eUICC 12 of the module 10, connected to a processing unit 2 of the device 1 under control. The module may take the form of the embodiments described with reference to Figs 1 and 2, although certain details are left out in Figs 4 for the sake of simplicity, such as the optional common substrate 16.
In Fig. 4A, a secure element OS 121 of the eUICC 12 may be configured to run in accordance with a normal state, e.g. in an open domain using an active service provider profile, with a certain set of applications and data. As such, the module 10 is configured to receive state request signals conveyed by radio over a cellular network. In this normal state, the device processing unit 2 is fully operative, or at least not inhibited by means of the module 10. The arrow symbolizes an incoming network lock request, and in this embodiment that state request signal comprises data which is interpreted in the module 10 as an alert state request. This data may be encoded information, or simply a signal of predetermined character that is recognized in the module to have the meaning of an alert request signal.
When the modem receives and interprets the lock request, this will have effect on the module 10 itself, and on the device 1 it is set to control. The module 10 is configured to switch from the active service provider domain to the root domain 122, responsive to the alert state request. Alternatively, if only the root domain 122 exists, that root domain 122 is set to a security mode in which it acts as a state machine.
Fig. 4B illustrates how the module 10 operating in the root security domain has activated the alert state, by inhibiting operation of the device processing unit 2. According to the invention, it is realized by denying or interfering access to a system clock 14 for the processing unit 2.
Unlocking of a device 1 may be executed by changing from an alert state to a normal state. This is preferably obtained by sending a state request signal through a network, comprising data which is interpreted in the module 10 as a normal state request. A normal state request may be received via radio through the modem 11, similar to the scenario of Fig. 4A. Such an unlock request will cause unlocking of the eUICC, and subsequently the unlocked eUICC will operate to switch the state machine from alert state to normal state for control of the device 1. In this process, full operability of the processing unit is preferably allowed. The eUICC 12 and the modem 10 are then preferably rebooted, so as to enable a selected active profile.
Embodiments of the invention have been discussed in the foregoing on a general level, and with respect to certain embodiments. The module 10 may be configured for use to control different types of devices 1, such as e.g. a car, a camera, a computer, a television set etc., even if that device itself does not incorporate cellular network capabilities. The embodiment described have in common that the network control of the module is separate from the operation of the device as such, whereas control of the device 1 in different states may involve inhibiting full operability of a processing unit of the device.
A module (10) for controlling usability of a processing unit (2) of a device (1), the module comprising:
a modem (11) for communicating with a cellular network (14), and
an eUICC (12), Embedded Universal Integrated Circuit Card, connected to the modem for cellular network authentication and access, the eUICC including a secure element comprising a state machine configured to control the device in accordance with one of a plurality of usability states, including at least a normal state and an alert state, wherein the module (10) is connected to selectively impede access to system clock for the processing unit (2), to inhibit operation of the processing unit in said alert state.
2. The module of claim 1, wherein the secure element includes a circuit which is non-detachably connected to the processing unit.
3. The module of any of the preceding claims, comprising a security domain including applications and registers for setting the usability state of the processing unit.
4. The module of any of the preceding claims, wherein the secure element is configured to impede system clock enablement for the processing unit in the alert state.
5. The module of any of the preceding claims, wherein the secure element is configured to impede supply voltage to the processing unit in the alert state.
6. The module of claim 3, wherein the security domain is accessible by radio signaling through the modem for setting a usability state.
7. The module of any of the preceding claims, comprising or being connected to a positioning unit configured to establish a position of the module.
8. The module of claim 7, wherein the module is configured to transmit position data in said alert state.
9. The module of claim 1, wherein the eUICC (12) and the processing unit (2) are carried on a common substrate (16).
A method for controlling usability of a processing unit (2) of a device (1) by means of a module (10) comprising a modem (11) for communicating with a cellular network (14), an eUICC (12), Embedded Universal Integrated Circuit Card, connected to the modem for cellular network authentication and access, the eUICC including a secure element comprising a state machine, the method comprising the steps of:
- at power up of the device (1), starting the module (10);
- determining, by means of the state machine, a usability state set for the processing unit (2);
- inhibiting operation of the processing unit responsive to determining that the usability state is an alert state by selectively impeding access to system clock for the processing unit (2).
The method of claim 10, after the step of starting the module, comprising the steps of:
- establishing a network connection by means of the modem to;
- obtaining an online usability state request from the network;
- setting the usability state in the secure element in accordance with the request.
Modul (10) zum Steuern der Verwendbarkeit einer Verarbeitungseinheit (2) einer Vorrichtung (1), wobei das Modul Folgendes umfasst:
ein Modem (11) zum Kommunizieren mit einem Mobilfunknetz (14), und
eine eUICC (12), Embedded Universal Integrated Circuit Card, die mit dem Modem für Mobilfunknetz-Authentifizierung bzw. Zugriff auf dieses verbunden ist, wobei die eUICC ein sicheres Element beinhaltet, das eine Zustandsmaschine umfasst, die ausgelegt ist zum Steuern der Vorrichtung gemäß einem aus einer Vielzahl von Verwendbarkeitszuständen, die zumindest einen Normalzustand und einen Warnzustand beinhalten, wobei das Modul (10) derart verbunden ist, dass es selektiv einen Zugriff auf einen Systemtakt der Verarbeitungseinheit (2) verhindert, um den Betrieb der Verarbeitungseinheit in dem Warnzustand zu blockieren.
2. Modul nach Anspruch 1, wobei das sichere Element eine Schaltung beinhaltet, die nicht abtrennbar mit der Verarbeitungseinheit verbunden ist.
3. Modul nach einem der vorhergehenden Ansprüche, umfassend einen Sicherheitsbereich, der Anwendungen und Register zum Einstellen des Verwendbarkeitszustands der Verarbeitungseinheit beinhaltet.
4. Modul nach einem der vorhergehenden Ansprüche, wobei das sichere Element ausgelegt ist zum Verhindern einer Systemtaktfreigabe für die Verarbeitungseinheit in dem Warnzustand.
5. Modul nach einem der vorhergehenden Ansprüche, wobei das sichere Element ausgelegt ist zum Verhindern einer Zufuhr von Spannung für die Verarbeitungseinheit in dem Warnzustand.
6. Modul nach Anspruch 3, wobei der Sicherheitsbereich durch Funksignalisierung über das Modem zugänglich ist, um einen Verwendbarkeitszustand einzustellen.
7. Modul nach einem der vorhergehenden Ansprüche, umfassend eine Positionierungseinheit oder verbunden mit einer solchen, die ausgelegt ist zum Feststellen einer Position des Moduls.
8. Modul nach Anspruch 7, wobei das Modul ausgelegt ist zum Übertragen von Positionsdaten in dem Warnzustand.
9. Modul nach Anspruch 1, wobei die eUICC (12) und die Verarbeitungseinheit (2) auf einem gemeinsamen Substrat (16) getragen werden.
Verfahren zum Steuern der Verwendbarkeit einer Verarbeitungseinheit (2) einer Vorrichtung (1), mittels eines Moduls (10), das ein Modem (11) zum Kommunizieren mit einem Mobilfunknetz (14), eine eUICC (12), Embedded Universal Integrated Circuit Card, die mit dem Modem für Mobilfunknetz-Authentifizierung bzw. Zugriff auf dieses verbunden ist, umfasst, wobei die eUICC ein sicheres Element beinhaltet, das eine Zustandsmaschine umfasst, wobei das Verfahren die folgenden Schritte umfasst:
- bei Einschalten der Vorrichtung (1), Starten des Moduls (10);
- Bestimmen, mittels der Zustandsmaschine, eines Verwendbarkeitszustandssatzes für die Verarbeitungseinheit (2);
- Blockieren des Betriebs der Verarbeitungseinheit als Reaktion darauf, dass der Verwendbarkeitszustand ein Warnzustand ist, durch selektives Verhindern von Zugriff auf den Systemtakt für die Verarbeitungseinheit (2) .
Verfahren nach Anspruch 10, das, nach dem Schritt des Startens des Moduls, die folgenden Schritte umfasst:
- Herstellen einer Netzverbindung mittels des Modems zum:
- Erhalten einer Online-Verwendbarkeitszustand-Anfrage von dem Netz;
- Einstellen des Verwendbarkeitszustands in dem sicheren Element gemäß der Anfrage.
Module (10) de commande de l'aptitude à l'utilisation d'une unité (2) de traitement d'un dispositif (1), le module comportant :
un modem (11) servant à communiquer avec un réseau cellulaire (14), et
une eUICC (12), carte à circuit intégré universelle incorporée, reliée au modem pour l'authentification et l'accès au réseau cellulaire, l'eUICC incluant un élément sécurisé comportant une machine à états configurée pour commander le dispositif selon un état parmi une pluralité d'états d'aptitude à l'utilisation, comprenant au moins un état normal et un état d'alerte, le module (10) étant connecté de façon à bloquer sélectivement l'accès de l'unité (2) de traitement à l'horloge du système, afin d'inhiber le fonctionnement de l'unité de traitement dans ledit état d'alerte.
2. Module selon la revendication 1, l'élément sécurisé comprenant un circuit qui est relié de façon non détachable à l'unité de traitement.
3. Module selon l'une quelconque des revendications précédentes, comportant un domaine de sécurité incluant des applications et des registres destinés à spécifier l'état d'aptitude à l'utilisation de l'unité de traitement.
4. Module selon l'une quelconque des revendications précédentes, l'élément sécurisé étant configuré pour bloquer l'activation de l'horloge du système pour l'unité de traitement dans l'état d'alerte.
5. Module selon l'une quelconque des revendications précédentes, l'élément sécurisé étant configuré pour bloquer une tension d'alimentation vers l'unité de traitement dans l'état d'alerte.
6. Module selon la revendication 3, le domaine de sécurité étant accessible par une signalisation radio par l'intermédiaire du modem pour spécifier un état d'aptitude à l'utilisation.
7. Module selon l'une quelconque des revendications précédentes, comportant ou étant relié à une unité de positionnement configurée pour établir une position du module.
8. Module selon la revendication 7, le module étant configuré pour émettre des données de position dans ledit état d'alerte.
9. Module selon la revendication 1, l'eUICC (12) et l'unité (2) de traitement étant portées sur un substrat commun (16).
Procédé de commande de l'aptitude à l'utilisation d'une unité (2) de traitement d'un dispositif (1) au moyen d'un module (10) comportant un modem (11) servant à communiquer avec un réseau cellulaire (14), une eUICC (12), carte à circuit intégré universelle incorporée, reliée au modem pour l'authentification et l'accès au réseau cellulaire, l'eUICC incluant un élément sécurisé comportant une machine à états, le procédé comportant les étapes consistant à :
- démarrer le module (10) à la mise sous tension du dispositif (1) ;
- déterminer, au moyen de la machine à états, un état d'aptitude à l'utilisation spécifié pour l'unité (2) de traitement ;
- inhiber le fonctionnement de l'unité de traitement en réponse à la détermination du fait que l'état d'aptitude à l'utilisation est un état d'alerte en bloquant sélectivement l'accès de l'unité (2) de traitement à l'horloge du système.
Procédé selon la revendication 10 comportant, après l'étape de démarrage du module, les étapes consistant à :
- établir une connexion de réseau au moyen du modem pour ;
- obtenir une demande d'état d'aptitude à l'utilisation en ligne en provenance du réseau ;
- spécifier l'état d'aptitude à l'utilisation dans l'élément sécurisé conformément à la demande.