Patent Number: 6,763,461

Title: Method of detecting fraud in electronic circuit cards used in telephony

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.

Inventors: Barakat; Simon (Saint Germain les Arpajon, FR)

Assignee: Schlumberger Systemes

International Classification: G06K 7/00 (20060101); H04M 17/00 (20060101); H04M 17/02 (20060101); H04K 001/00 (); H04L 009/00 (); G06F 017/60 ()

Expiration Date: 07/13/2021