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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

  • US 5,146,499 A
  • Filed: 10/22/1990
  • Issued: 09/08/1992
  • Est. Priority Date: 10/27/1989
  • Status: Expired due to Fees
First Claim
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1. A data processing system comprisinga) microprocessor means (MP) interfaced to an internal smart card reader (RD) and to a security microcircuit (PSMC);

  • b) a main bus (2);

    c) further data processing means connnected via said main bus to said microprocessor means, for cooperatively under control of a random number (RN) and a reversible algorithm (ALG) from said system authentifying a smart card (CAM) presented to said reader, by means of a first key (SK21) generated from first identity quantities (NI, NOP) from said card and an associated second key (SK21'"'"') generated from a second identity quantity (NI'"'"') from the security microcircuit, an authentification represented by correspondence among said first and second keys resulting in a correspondence signal;

    d) a start-up detection circuit (MCD) for detecting an initiation of said authentifying and thereupon generating a first control signal to said microprocessor means;

    e) a main bus blocking circuit (BBC) fed by said microprocessor means and further connected to said bus for under control of said first control signal generating a bus-unblocking signal of predetermined duration; and

    f) wherein absence of said correspondence signal before end of said duration drives said blocking circuit to generating and maintaining a continuous bus blocking signal.

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