System and method for user authentication employing dynamic encryption variables

  • US 5,937,068 A
  • Filed: 10/02/1997
  • Issued: 08/10/1999
  • Est. Priority Date: 03/22/1996
  • Status: Expired due to Term
First Claim
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1. A user authentication system for control of access of at least one user to a function, said system including at least one first unit personalized for said user and at least one second verification unit controlling access to said function,(a) said first unit comprising:

  • first generator means for producing at least two dynamic variables;

    first calculation means for producing a first password in accordance with at least one first encryption algorithm using input parameters dependent on said dynamic variables; and

    means for transmitting said first password to said second unit;

    (b) said second unit comprising;

    second generator means for, in response to an access request made by way of a specified one of said at least one first unit, producing at least two dynamic variables assigned to said specified one of said at least one first unit;

    second calculation means for producing a second password in accordance with at least one second encryption algorithm using input parameters dependent on said dynamic variables produced in said second unit;

    comparator means for comparing said first and second passwords; and

    means, responsive to said comparator means determining that a predetermined relationship exists between said passwords, for delivering an authorization of access to said function;

    wherein said first and second generator means provided respectively in said first and second units produce said at least two dynamic variables in concert, but independently.

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