Method and means to limit access to computer systems
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United States of America Patent
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Nov 19, 1991
Grant Date -
N/A
app pub date -
May 9, 1990
filing date -
May 9, 1990
priority date (Note) -
Expired
status (Latency Note)
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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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