System for controlling access to a function, using a plurality of dynamic encryption variables
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United States of America Patent
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-
Sep 1, 1998
Grant Date -
N/A
app pub date -
Mar 22, 1996
filing date -
Mar 22, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
The system includes a first card-like unit adapted to communicate with a second unit giving only conditionally access to a function. Both units are capable of running software for generating a password by means of encryption of a plurality of dynamic variables produced separately but in concert (so as to have a predetermined relationship, such as identity, with one another) in the units. The encryption is carried out in each unit by a public algorithm using a dynamically varying encryption key. Each time an access request is issued by a card user, the key is modified as a function of the number of access requests previously formulated by the card user. Access to the function is granted when the passwords generated in the units have a predetermined relationship (such as identity) with each other.
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