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Method and apparatus for cryptographic key establishment using an identity based symmetric keying technique

  • US 20030026433A1
  • Filed: 07/31/2001
  • Published: 02/06/2003
  • Est. Priority Date: 07/31/2001
  • Status: Active Grant
First Claim
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1. A method for establishing a cryptographic key between a first node and a second node, comprising:

  • sending a first message from the first node to the second node, wherein the first message requests establishing the cryptographic key;

    sending a second message from the second node to a key distribution center, wherein the second message includes a first node identifier for the first node, a second node identifier for the second node, and a message authentication code created using a second node key belonging to the second node;

    recreating the second node key at the key distribution center, wherein the second node key was previously created using the second node identifier and a secret key known only to the key distribution center;

    verifying at the key distribution center the message authentication code in the second message using the second node key; and

    if the message authentication code is verified, creating the cryptographic key at the key distribution center, and communicating the cryptographic key to the second node and the first node.

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