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Cellular telephone authentication system using a digital certificate

  • US 5,884,158 A
  • Filed: 10/15/1996
  • Issued: 03/16/1999
  • Est. Priority Date: 10/15/1996
  • Status: Expired due to Term
First Claim
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1. A system for determining authorized cellular telephone usage and connecting one or more cellular telephones to a telephone network, said system comprising:

  • means located in a cellular telephone for generating an authentication signal that contains a telephone number being called, a call count of the number of telephone calls made and a digital signature of telephone numbers called, and a seed number that may be changed after a specified number of calls have been made;

    means located at a site remote from the cellular telephone for verifying the authentication signal;

    means located at a site remote from the cellular telephone for comparing portions of the authentication signal to determine if specific portions of the authentication signal have been previously used to determine authorized cellular telephone usage;

    means for comparing the authentication signals to determine authorized cellular telephone usage; and

    means for connecting the cellular telephone to the network if the authentication signals are verified and specific portions of the authentication signal are verified.

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