Antifraud method and device for a selective access system
US5006698A · kind A · utility
7Cited by
9References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1988 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Jul 7, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/1083
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for protecting a selective access system against fraudulent use of a magnetic card having a confidential card. Each cade (CM) is associated with a class corresponding to a zone of a memory (PROM). The number of classes is equal to the number of zones and is substantially less than the number of cards (CM) which may be presented. At each failure to input a confidential code, one of the bits is modified in the corresponding memory zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.