Device authentication system for on and off line use

Details Device authentication system for on and off line use Device authentication system for on and off line use

1987-02-02

1989-01-03

Trafton, David L.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235449, 34082533, G06K 500

Patent

active

047958901

ABSTRACT:
A verification system for cards or other devices with an anticounterfeit characteristic and an escort memory, wherein for lower or routine levels of security, the escort memory serves to confirm part of the anticounterfeit characteristic and for higher levels of security a central station memory is employed to confirm another part of the anticounterfeit characteristic. Distinction between levels of security is determined on the basis of time or other criteria imposed from the central station.

REFERENCES:
patent: 4114027 (1978-09-01), Slater et al.
patent: 4450348 (1984-05-01), Stockburger et al.
patent: 4476468 (1984-10-01), Goldman
patent: 4568936 (1986-02-01), Goldman
patent: 4752676 (1988-06-01), Leonard et al.

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