Method and means to limit access to computer systems

Details Method and means to limit access to computer systems Method and means to limit access to computer systems

1990-05-09

1991-11-19

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 23, 380 3, G11B 2328, H04K 100

Patent

active

050671553

ABSTRACT:
In a preferred embodiment, a method of limiting access to computer systems which method includes scrambling identification card information with time information so that the resulting code can be used for only a limited period of time, thus preventing unauthorized persons from using the code at a later time. In another aspect of the invention, one or more .mu.-metal shields are embedded in an identification card, thus identifying the card as being valid and also providing means to indicate when a valid card is being removed from a card reader.

REFERENCES:
patent: 4599489 (1986-07-01), Cargile
patent: 4694492 (1987-09-01), Wirstrom et al.
patent: 4799258 (1989-01-01), Davies
patent: 4809326 (1989-02-01), Shigenaga
patent: 4885788 (1989-12-01), Takaragi et al.
patent: 4944008 (1990-07-01), Piosenka et al.
patent: 4951249 (1990-08-01), McClung et al.

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