Antifraud method and device for a selective access system

Details Antifraud method and device for a selective access system Antifraud method and device for a selective access system

1988-07-07

1991-04-09

Levy, Stuart S.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235379, 235492, 902 4, 902 5, 902 8, G06K 700, G07G 114

Patent

active

050066986

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.

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patent: 4578567 (1986-03-01), Granzow et al.
patent: 4629871 (1986-12-01), Scribner et al.
patent: 4684791 (1987-08-01), Bito
patent: 4798941 (1989-01-01), Watanabe
patent: 4801787 (1989-01-01), Suzuki

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