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Cryptographic protocol for secure communications

  • US 5,241,599 A
  • Filed: 10/02/1991
  • Issued: 08/31/1993
  • Est. Priority Date: 10/02/1991
  • Status: Expired due to Term
First Claim
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1. A method for generating a cryptographic key to a first symmetric key cryptosystem by using an authentication signal, said authentication signal being available to a plurality of parties, said method comprising the steps of:

  • forming an outgoing signal by encrypting at least a portion of an excitation signal with a second symmetric key cryptosystem using a key based on said authentication signal, said excitation signal being based on a first signal, RA ;

    transmitting said outgoing signal to one of said parties;

    receiving a response signal, Q, in response to said outgoing signal; and

    generating said cryptographic key based on said first signal and on said response signal.

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