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

1991-04-04

1993-08-03

Cain, David

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 382 7, 235449, 70276, H04K 100

Patent

active

052336581

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.

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patent: 5014325 (1991-05-01), Moritomo
patent: 5083309 (1992-01-01), Beysson

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