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Initial secret key establishment including facilities for verification of identity

  • US 6,061,791 A
  • Filed: 04/22/1999
  • Issued: 05/09/2000
  • Est. Priority Date: 05/09/1997
  • Status: Active Grant
First Claim
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1. A method of establishing a secret cryptographic key shared between an applicant and an issuer comprising the steps of:

  • providing said applicant with a registration computer program means, said registration computer program means having a public key of said issuer and public key encryption capability;

    generating said secret key using at least some random information at an applicant end;

    generating a pass reply message using at least some arbitrary information at said applicant end;

    encrypting said secret key and said pass reply using said public key to form at least one encryption message, said message including information allowing said issuer to identify said applicant;

    sending said encryption message to said issuer by telecommunications means;

    decrypting said encryption message at an issuer end to retrieve said secret key and said pass reply using a private key of said issuer;

    receiving a second communication from said applicant at said issuer end separate from said encryption message over a channel that enables said issuer to ascertain said second communication to be genuinely from said applicant, said second communication containing said pass reply;

    confirming a validity of said secret key at least with said issuer if said pass reply received during said second communication matches said pass reply decrypted, whereby said secret key may be confirmed for use in future transactions.

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