Global patent index - EP 1033008 A2

EP 1033008 A2 2000-09-06 - ENCRYPTION SYSTEM FOR SECURE DATA

Title (en)

ENCRYPTION SYSTEM FOR SECURE DATA

Title (de)

VERSCHLÜSSELUNGSSYSTEM ZUR DATENSICHERUNG

Title (fr)

SYSTEME DE CRYPTAGE POUR PROTECTION DES DONNEES

Publication

EP 1033008 A2 (EN)

Application

EP 98953158 A

Priority

  • US 9817839 W
  • US 91919897 A
  • US 91921297 A
  • US 91936697 A
  • US 91920397 A

Abstract (en)

[origin: WO9910859A2] A data security system for digitized data that can use both encryption and steganographic techniques. Data is encrypted using selected encryption protocols and algorithms. The resulting ciphertext is then treated to a steganographic encoding into a secondary data stream. This encoding is performed by replacing the least significant bit of selected bytes in the secondary data stream with the bits of the ciphertext. Selection of those bytes is performed via ciphertext created using a separate encryption procedure that uses an encryption key as both the key and as the data to be encrypted. The format of the secondary data stream is usually chosen so that it will not be obvious that it has been modified. The modified data can either be stored for later use or transmitted to the intended recipient. Decoding is accomplished by using the cyphertext to find the selected bytes in the modified secondary data stream, extracting the least significant bits, and reassembling those bits into the original data. These encryption techniques are also used for backing up data in a secure manner. The data to be backed up is first encrypted using selected encryption protocols and algorithms. The resulting ciphertext is then split into multiple parts and each part is stored on a separate floppy disk in selected locations that are determined by a separate encryption process which produces a selection cyphertext to select the storage locations. The remaining areas of each floppy disk are then filled in with random data to obscure the identity of the backed up information. Restoration of the original data is accomplished by using the selection cyphertext to locate the stored data on each floppy, reading that data and reassembling it into a data block, and then merging the data blocks from each floppy to recreate the original data.

IPC 1-7 (main, further and additional classification)

H04L 9/06

IPC 8 full level (invention and additional information)

H04L 9/18 (2006.01)

CPC (invention and additional information)

H04L 9/065 (2013.01); H04L 2209/16 (2013.01); H04L 2209/34 (2013.01)

Citation (search report)

See references of WO 9910859A3

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9910859 A2 19990304; WO 9910859 A3 19990617; AU 1060499 A 19990316; EP 1033008 A2 20000906

INPADOC legal status

2002-10-30 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20020301

2000-09-06 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000327

2000-09-06 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE