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Method and system for authenticating messages exchanged in a communications system

  • US 7,634,280 B2
  • Filed: 02/02/2006
  • Issued: 12/15/2009
  • Est. Priority Date: 02/17/2005
  • Status: Active Grant
First Claim
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1. In a communications system supporting the exchange of messages, a method for authenticating messages, comprising the step of:

  • receiving a first message to be authenticated from a message sender to a signature generator entity in the communication system, wherein the signature generator entity is a computer program executed by a processor of a computer system coupled to the communication system;

    the processor that executes the signature generator entity generating a signature with respect to the received first message, the signature being dependent on the message sender, wherein said signature comprises a first-level key and a second-level key, wherein the first-level key is determined by information regarding the message sender, and wherein the second-level key is determined by information regarding the signature generator entity;

    sending back to the message sender an authenticated first message, the authenticated first message including the generated signature;

    forwarding the authenticated first message from the message sender to a message recipient;

    receiving, from the message recipient, a second message that requests verifying the forwarded first message;

    sending the received second message to a signature verifier entity for a verification outcome of the first message;

    receiving the verification outcome from the signature verifier entity that had verified the validity of the signature in the authenticated first message; and

    notifying the message recipient of the verification outcome.

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