EP 2526646 A1 20121128 - SECURE RENEWAL OF CRYPTOGRAPHIC KEYS
Title (en)
SECURE RENEWAL OF CRYPTOGRAPHIC KEYS
Title (de)
SICHERE ERNEUERUNG KRYPTOGRAPHISCHER SCHLÜSSEL
Title (fr)
RENOUVELLEMENT SÉCURISÉ DE CLEFS CRYPTOGRAPHIQUES
Publication
Application
Priority
- DE 102010001137 A 20100122
- EP 2010067833 W 20101119
Abstract (en)
[origin: WO2011088919A1] The invention relates to a method for the secure renewal of a cryptographic key k having partial keys kl and k2, which are used for secure communication between subscribers A and B, said method comprising steps of transmitting a first message from A to B, wherein the first message contains the following: MID, Na, MAC [k1] (MID, Na); transmitting a second message from B to A, wherein the second message contains the following: MID, Nb, MAC [k1] (MID, Na, Nb); wherein MID is an identification of A, Na is a number generated by A, Nb is a number generated by B and MAC [k1] (...) is the value of a one-way function MAC on the basis of the partial key kl; and determining a renewed key k' on the basis of both random numbers Na und Nb and of the partial key k2.
IPC 8 full level
H04L 9/08 (2006.01)
CPC (source: EP)
H04L 9/0891 (2013.01)
Citation (search report)
See references of WO 2011088919A1
Designated contracting state (EPC)
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
DOCDB simple family (publication)
WO 2011088919 A1 20110728; DE 102010001137 A1 20110728; EP 2526646 A1 20121128
DOCDB simple family (application)
EP 2010067833 W 20101119; DE 102010001137 A 20100122; EP 10785021 A 20101119