Method of generating a unique number for a smart card and its use for the cooperation of the card with a host system
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United States of America Patent
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Nov 26, 1991
Grant Date -
N/A
app pub date -
Aug 22, 1990
filing date -
Aug 22, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A smart card (1) which includes a random access memory RAM (10) and a read-only memory PROM (7) incorporating a production key (PK), a distributor key (MK), a bearer code (CP) and a serial number (NS) generates a unique number (NU) which is stored in the memory RAM (10) in the card after execution of the following steps of a program which is specific of the card: a - modulo-2 addition and storage in the RAM (10) of the result: PK.sym.MK=KMP, b - the encryption of a unique input message ME, generated by the card, by means of a reversible algorithm (ALG, ALB.sup.-1) using the key KMP: NU=ALG.sub.KMP (ME).
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