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System and method for efficiently implementing an authenticated communications channel that facilitates tamper detection

  • US 6,289,451 B1
  • Filed: 04/18/1997
  • Issued: 09/11/2001
  • Est. Priority Date: 04/18/1997
  • Status: Expired due to Term
First Claim
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1. A communications system comprising a plurality of communication devices interconnected by a network, two of said communication devices engaging in a communication session to transfer message packets therebetween,A. said two communication devices prior to said communication session initially engaging in a session establishment operation in which one of said two communication devices generates a session key and transfers the session key privately to the other of said two communication devices, B. the two communication devices, during the communication session, transferring data therebetween in at least one message packet, i. one of said two communication devices generating said at least one message packet to include said data and a hash value generated by applying a selected hash function to said data and said session key, and ii. the other of said two communication devices, upon receiving said at least one message packet, generating a hash value from the data in said message packet and said session key, and comparing the generated hash value to the hash value in the message packet.

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