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Authentication in a packet data network

  • US 7,107,620 B2
  • Filed: 01/08/2001
  • Issued: 09/12/2006
  • Est. Priority Date: 03/31/2000
  • Status: Expired due to Term
First Claim
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1. Authentication method for authenticating a mobile node to a packet data network, comprising the steps of:

  • providing the mobile node with a mobile node identity and a shared secret specific to the mobile node identity and usable by a telecommunications network;

    providing the mobile node with a protection code;

    sending the mobile node identity and the protection code from the mobile node to the packet data network;

    providing the packet data network with authentication information usable by the telecommunications network, the authentication information comprising a challenge based on RAND codes of at least two authentication triplets of the telecommunications network, and a session secret corresponding to the mobile node identity and derivable using the challenge and the shared secret;

    forming cryptographic information using at least the protection code and the session secret;

    sending the challenge and the cryptographic information from the packet data network to the mobile node;

    checking at the mobile node the validity of the cryptographic information using the challenge and the shared secret;

    generating at the mobile node the session secret and a first response corresponding to the challenge, based on the shared secret;

    sending the first response to the packet data network; and

    checking the first response for authenticating the mobile node.

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