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Access security control

  • US 4,464,566 A
  • Filed: 09/29/1982
  • Issued: 08/07/1984
  • Est. Priority Date: 09/21/1970
  • Status: Expired due to Fees
First Claim
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1. A system for access control, for selectivley granting access on presentation and authentication of a control token, said system comprising:

  • A. a bank comprising(1) storage means for storing a plurality of unique authenticating master coded bit patterns, each in different address locations;

    said coded bit patterns comprising magnetically altered areas;

    (2) a plurality of address locations in said storage means, each address being an index of the bit pattern stored therein; and

    (3) means to produce a plurality of unique bit patterns;

    B. a plurality of control tokens, each control token comprising(1) an unique object;

    (2) means on said object for storing in machine readable form an unique index;

    (3) means on said object for storing in machine readable and machine writeable form an unique coded bit pattern;

    (4) each of said control tokens having one of said unique indicia and the corresponding unique authenticating coded bit patterns stored in said bank;

    C. reading means to which a control token can be presented, said reading means including first means to read said indicium, and second means to read said coded bit pattern on said token;

    D. means responsive to said first means to select from said bank said coded bit pattern corresponding to said indicium;

    E. means to compare the unique bit pattern read from said token with the stored bit pattern in said bank corresponding to the read indicium, andF. means responsive to said comparison means to select a different unique bit pattern from said means to produce, and to write a new unique bit pattern on said token and in said bank in an address corresponding to said indicium on said token.

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