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802.11 using a compressed reassociation exchange to facilitate fast handoff

  • US 7,350,077 B2
  • Filed: 04/17/2003
  • Issued: 03/25/2008
  • Est. Priority Date: 11/26/2002
  • Status: Active Grant
First Claim
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1. A method for establishing a secure association for a mobile node with a network, the steps comprising:

  • associating with an access point;

    authenticating the mobile node using an extensible authentication protocol by the access point;

    establishing a network session key; and

    wherein the network session key is used to establish a key request key and a base transient key;

    wherein the base transient key is used as a counter mode key generator to provide fresh pairwise transient keys;

    wherein the key request key is used by the mobile node to prove it has proper authorization for a session;

    wherein roaming after establishing the network session key comprises;

    incrementing a rekey number, producing an incremented rekey number,generating a fresh pairwise transient key based on the incremented rekey number;

    sending a reassociation request to a new access point, the reassociation request containing the incremented rekey number, andverifying the new access point is using the fresh pairwise transient key based on the incremented rekey number.

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