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Method and apparatus for relaying digitally signed messages

  • US 5,943,426 A
  • Filed: 09/22/1997
  • Issued: 08/24/1999
  • Est. Priority Date: 09/25/1995
  • Status: Expired due to Term
First Claim
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1. A method of transferring a digitally signed message from a first gateway to a second gateway via a communication channel, said method comprising the steps of:

  • receiving an original message at said first gateway, said original message having an original digital signature associated therewith;

    verifying an authenticity of said original digital signature with respect to said original message at said first gateway;

    deriving, at the first gateway, target information from said original message based on predefined rules;

    reducing, at the first gateway, said original message by replacing non-target information with said target information to create a reduced message, said target information having a lower information content than said non-target information;

    determining a gateway digital signature for said reduced message thereby preserving an accurate and verifiable digital signature when transferred over the communication channel;

    sending said reduced message and said gateway digital signature from said first gateway to said second gateway via said communication channel wherein said reduced message occupies less bandwidth than said original message;

    predicting, at said second gateway, said non-target information based on said predefined rules and said target information, said predicted non-target information differing from said non-target information; and

    expanding said reduced message by replacing said target information with said predicted non-target information.

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