Process and apparatus for authenticating the signature of a sign

Details Process and apparatus for authenticating the signature of a sign Process and apparatus for authenticating the signature of a sign

1985-11-20

1987-04-07

Yusko, Donald J.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

235380, 34082534, H04Q 900, G06K 500

Patent

active

046564748

ABSTRACT:
A process and a device for authenticating the signature of a signed message includes a nominal signature card (1a) coupled to a transmitting device 1 which sends signed messages. The card (1a) includes at least one memory (5) in which there are secretly prerecorded at least one secret key (S) and one program (P) which automatically processes the signature of a message (M), as well as circuits (6) for computing the signature (SG). A control card (3b), which is not nominal, is coupled to a device (3) for receiving signed messages. The card (3b) includes at least one memory in which there are secretly prerecorded at least the secret key (S) and the program (P) for recomputing via processing circuits (15) the signature (SG) of the received message (M).

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