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Databaseless security system

  • US 5,120,939 A
  • Filed: 11/09/1989
  • Issued: 06/09/1992
  • Est. Priority Date: 11/09/1989
  • Status: Expired due to Fees
First Claim
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1. A system for enabling entry into a secure facility, the system including a portable object and means for transferring data between the portable object and the facility,the facility comprising:

  • memory means for storing encryption algorithms E1 and E2 ;

    means for generating a challenge number;

    means responsive to an identification signal, supplied by the portable object itself, that identifies the particular portable object seeking to gain access to the facility, and to encryption algorithm E1 for generating a secret code;

    means responsive to the challenge number, to the secret code and to encryption algorithm E2 for generating a first response signal;

    means for comparing the first response signal with a second response signal generated by the portable object, and for providing an enabling signal when the comparison is favorable;

    the portable object comprising;

    means for supplying the identification signal;

    memory means for storing the secret code and the encryption algorithm E2, but not encryption algorithm E1 used for generating the secret code, said secret code and encryption algorithm E2 having been previously generated and entered into the memory means; and

    means responsive to the secret code, to the challenge number received from the facility, and to encryption algorithm E2 for generating the second response signal and transmitting same to the facility.

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