Global Patent Index - EP 1254534 A1

EP 1254534 A1 2002-11-06 - COMMUNICATION METHOD WITH ENCRYPTION KEY ESCROW AND RECOVERY

Title (en)

COMMUNICATION METHOD WITH ENCRYPTION KEY ESCROW AND RECOVERY

Title (de)

KOMMUNIKATIONSVERFAHREN MIT SCHLÜSSELHINTERLEGUNG UND SCHLÜSSELRÜCKGEWINNUNG

Title (fr)

PROCEDE DE COMMUNICATION AVEC SEQUESTRE ET RECUPERATION DE CLE DE CHIFFREMENT

Publication

EP 1254534 A1 (FR)

Application

EP 01904002 A

Priority

  • FR 0100285 W
  • FR 0001185 A

Abstract (en)

[origin: FR2804561A1] The invention concerns a method whereby the entity starting a communication session generates a session key (KS) using a pseudo-random generator initialised by the secret key (Sa) of the entity and an initial value (VI). The message is encrypted by the session key. The latter can be retrieved by the escrow authority (Ta), which archives the secret key (Sa) and can recover the initial value (VI). The invention is applicable to secure communications.

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

H04L 9/08

IPC 8 full level (invention and additional information)

H04L 9/08 (2006.01); H04L 9/32 (2006.01)

CPC (invention and additional information)

H04L 9/0894 (2013.01); H04L 9/0841 (2013.01); H04L 9/14 (2013.01)

Citation (search report)

See references of WO 0156222A1

Designated contracting state (EPC)

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

EPO simple patent family

FR 2804561 A1 20010803; FR 2804561 B1 20020301; EP 1254534 A1 20021106; JP 2003521197 A 20030708; US 2003012387 A1 20030116; WO 0156222 A1 20010802

INPADOC legal status


2009-01-21 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20080801

2002-12-04 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: GILBERT, HENRI

2002-12-04 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: ARDITTI, DAVID

2002-12-04 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: BARITAUD, THIERRY

2002-12-04 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: CHAUVAUD, PASCAL

2002-11-06 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020716

2002-11-06 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

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