Data processing system comprising authentification means viz a viz a smart card, an electronic circuit for use in such system, and a procedure for implementing such authentification
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 8, 1992
Grant Date -
N/A
app pub date -
Oct 22, 1990
filing date -
Oct 27, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Authentication of a smart card is accomplished utilizing a microcomputer (PC) provided with an internal reader (RD) and an electronic circuit (3) linked to the PC. The circuit (3) includes a microprocessor (MP) capable of generating a random factor (RN). The circuit (3) also includes a startup circuit (MCD) generating a time delay period T, a security microcircuit (PSMC) and a blocking circuit (BBC). Between these elements, a cryptographic procedure, of the DES or DEA type, is effected which aims at establishing the consistency between a key (SK2I) associated with dedicated identity numbers (IN, OPN) of the smart card (CAM) and a key (SK2I') associated with a corresponding dedicated identity number (IN') of the PC in the PSMC. The system is automatically blocked in the case of inconsistency.
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