Wired microcircuit card and a method for transactions between a corresponding wired microcircuit card and a terminal
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United States of America Patent
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Jul 7, 1992
Grant Date -
N/A
app pub date -
Jul 17, 1990
filing date -
Jul 19, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention concerns a microcircuit card of the kind comprising: a communication interface; an internal memoryp a wired processor unit allowing this internal memory to be addressed from the outside. According to the main characteristic of the invention, provision is made for a secret internal memory zone not addressable from the outside, and the processor unit comprises a wired circuit capable of using the contents of the secret memory for establishing a first serial cryptographic function of two operands and means reacting to the interrogation of predetermined addresses of the internal memory, accompanied by a keyword by applying this keyword and the output of the internal memory as operands of the wired circuit, whilst the output of the wired circuit is applied to the interface.
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