Method of detecting fraud in electronic circuit cards used in telephony
US6763461B1 · kind B1 · utility
0Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1999 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Dec 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2215/0148
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.