Global Patent Index - EP 1221223 A1

EP 1221223 A1 20020710 - METHOD FOR GENERATING/REGENERATING A CIPHER KEY FOR A CRYPTOGRAPHIC METHOD

Title (en)

METHOD FOR GENERATING/REGENERATING A CIPHER KEY FOR A CRYPTOGRAPHIC METHOD

Title (de)

VERFAHREN ZUR GENERIERUNG/REGENERIERUNG EINES CHIFFRIERSCHLÜSSELS FÜR EIN KRYPTOGRAPHIEVERFAHREN

Title (fr)

PROCEDE DESTINE A GENERER/REGENERER UNE CLE DE CODAGE POUR UN PROCEDE DE CRYPTOGRAPHIE

Publication

EP 1221223 A1 20020710 (DE)

Application

EP 00953018 A 20000706

Priority

  • DE 19935285 A 19990727
  • EP 0006387 W 20000706

Abstract (en)

[origin: WO0108347A1] The invention relates to a method for generating/regenerating a cipher key for a cryptographic method, whereby a cipher key and a public key are created from a random number (seed) according to a predetermined deterministic method. According to said method, the seed is created only on the user side through the use of values which are only known to the user. Regeneration information appropriate to the seed regeneration, which allows for the seed to be derived in a deterministic manner from the confidence station through a combination with information known only to said confidence station, is created on the user side and stored in a lossproof manner. In the event of loss of the cipher key, the seed is reproduced on the confidence station side by combining the regeneration information with secrete information.

IPC 1-7

H04L 9/08

IPC 8 full level

H04L 9/08 (2006.01)

CPC (source: EP)

H04L 9/0841 (2013.01); H04L 9/0869 (2013.01)

Citation (search report)

See references of WO 0108347A1

Designated contracting state (EPC)

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

DOCDB simple family (publication)

WO 0108347 A1 20010201; AU 2482801 A 20010213; CA 2378729 A1 20010201; CA 2378729 C 20100216; DE 19935285 A1 20010308; DE 19935285 B4 20120705; EP 1221223 A1 20020710; US 7162037 B1 20070109

DOCDB simple family (application)

EP 0006387 W 20000706; AU 2482801 A 20000706; CA 2378729 A 20000706; DE 19935285 A 19990727; EP 00953018 A 20000706; US 4925802 A 20020522