Method for generating a random number in a data processing system/and system for implementing the method
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United States of America Patent
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Jan 5, 1993
Grant Date -
N/A
app pub date -
Aug 9, 1991
filing date -
Dec 19, 1989
priority date (Note) -
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status (Latency Note)
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Abstract
In a data processing system using portable objects (1) such as cards incorporating memory chips (11, 12, 13, 14, 15) and a processing circuit (10), where a first memory zone (11) is electrically erasable and writable at the request of the processing circuits in the object, random numbers are generated taking into account a first parameter taken from the first zone (11) and at least one second parameter written in a second, nonvolatile zone (12) of the object, the content of this second zone being modified each time the first zone is erased such that the combination of parameters is never identical following the various erase operations on the first zone.
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