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Computer access control system and method

  • US 5,060,263 A
  • Filed: 03/09/1988
  • Issued: 10/22/1991
  • Est. Priority Date: 03/09/1988
  • Status: Expired due to Term
First Claim
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1. An access control system, comprising:

  • at least one protected system, each protected system including means for reading a password submitted by a user as part of a request for access to at least a specified portion of said protected system, means for conveying information to said user, and digital computer means coupled to said reading means and said information conveying means for determining whether to permit access to said protected system;

    said digital computer means including;

    means for storing at least one authentic password;

    means for selecting any sequence of one or more encryption steps from a multiplicity of distinct predefined encryption steps;

    means for generating a new authentic password by encrypting a stored password with the first of said selected sequence of predefined encryption steps and, when said sequence contains more than one encryption step, successively encrypting the result of each previous encryption step with the next of said selected sequence of predefined encryption steps;

    means for challenging said user, via said information conveying means, to encrypt a previously defined password value with said selected sequence of encryption steps and to submit a password which is the result of said selected sequence of encryption steps; and

    means for comparing said new authentic password with said submitted password, and for permitting access to said portion of said protected system when a submitted password matches said new authentic password;

    said access control system further including at least one portable passward issuing device for issuing authentic passwords to the possessor thereof, including storage means for separately storing said previously defined password for each of one or more distinct protected systems or portions of protected systems.

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