Method of detecting fraud in electronic circuit cards used in telephony
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United States of America Patent
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Jul 13, 2004
Grant Date -
N/A
app pub date -
Dec 29, 1999
filing date -
Dec 30, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Detecting fraud involving use of an asynchronous circuit in the place of a card having an electronic circuit that is synchronous. A given excitation signal is applied to the electronic circuit of the card on power-up, a response pattern supplied by the circuit is recorded, the response pattern is compared with a reference pattern corresponding to the response expected from the electronic circuit to said excitation signal, and fraud conducted by means of an asynchronous circuit is identified in the event of the comparison being negative.
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