Method and device to increase the protection of a chip card
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United States of America Patent
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Dec 19, 1995
Issued Date -
N/A
app pub date -
Dec 14, 1993
filing date -
Oct 9, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
The method is designed to increase the protection of a microcircuit-based memory card comprising at least one memory coupled to a data-processing element. When said data-processing element receives a command by a data signal external to the card, said method consists in making said data-processing element emit a ratification signal at an instant that is deferred, with respect to the instant at which its emission was prompted by the data signal, by a duration that is randomly variable in time. The disclosed method can be applied to microcircuit-based memory cards.
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