05802176 is referenced by 216 patents and cites 8 patents.

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.

Title
System for controlling access to a function, using a plurality of dynamic encryption variables
Application Number
8/620240
Publication Number
5802176
Application Date
March 22, 1996
Publication Date
September 1, 1998
Inventor
Yves Audebert
Croissy-sur-Seine
FR
Agent
Watson Cole Stevens Davis P L L C
Assignee
Activcard
FR
IPC
G06K 5/00
H04L 9/00
H04K 1/00
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