Method and device to increase the protection of a chip card

Details Method and device to increase the protection of a chip card Method and device to increase the protection of a chip card

1993-12-14

1995-12-19

Callahan, Timothy P.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235382, 235492, G06K 500, G06K 1906

Patent

active

054770394

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.

REFERENCES:
patent: 4471216 (1984-09-01), Herve
patent: 4870574 (1989-09-01), Lisisimaque

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