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Method and apparatus for calculating message signatures in advance

  • US 5,633,931 A
  • Filed: 06/30/1995
  • Issued: 05/27/1997
  • Est. Priority Date: 06/30/1995
  • Status: Expired due to Term
First Claim
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1. A method for authenticating a message transmitted from a sender to a receiver, comprising the steps of:

  • a) generating at the sender a message signature;

    b) sending from the sender to the receiver the message signature and a message;

    c) generating at the receiver, prior to receiving the message signature and message from the sender, a predicted message signature that is likely to be transmitted from the sender to the receiver;

    d) receiving at the receiver the message signature and message transmitted by the sender;

    e) comparing at the receiver the predicted message signature with the received message signature; and

    f) authenticating the message received by the receiver if the predicted message signature and the received message signature match.

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