Cryptography – Key management – Having particular key generator
Patent
1992-10-23
1994-06-28
Cangialosi, Salvatore
Cryptography
Key management
Having particular key generator
380 23, 380 25, 380 47, H04L 900
Patent
active
053254341
ABSTRACT:
Known methods for authenticating communication participants add a code word to a command signal, which code word is a crytographic function of the command signal and a key value which in its turn is a function of a master key value and a change code word. The master key value has a permanently fixed value, in contrast to the change code word which serves to change the key value. The method according to the invention makes use of a key value which is a function of at least one previous key value, the master key value with the permanently fixed value, which, once it has been discovered or leaked, substantially weakens the encryption, no longer being required.
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"Lifetimes of Keys in Cryptographic Key Management Systems" pp. 246-259; E. Okamoto and K. Nakamura.
Spaanderman Jurgen J.
Vlieg Klaas P.
Wenas Maria L.
Cangialosi Salvatore
Koninklijke PTT Nederland N.V.
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