Patent ID: 7158777
Filing Date: 2007-01-02
Classification: H04L,H04W

Abstract:
1. A method for authenticating a mobile node in a wireless local area network including at least two access points for setting up wireless association between the mobile node and an authentication server for authenticating the mobile node, the method comprising the steps of: (a) when the mobile node associates with a first access point and performs initial authentication, receiving, by the mobile node, a first session key for secure communication from the authentication server by using a first private key generated with a secret previously shared with the authentication server, and receiving, by the first access point, the first session key from the authentication server by using a second private key previously shared with the authentication server; and (b) when the mobile node is handed over from the first access point to a second access point and performs re-authentication, receiving, by the mobile node, a second session key for secure communication from the authentication server by using a third private key generated with authentication information generated during previous authentication and shared with the authentication server, and receiving, by the second access point, the second session key from the authentication server by using the second private key previously shared with the authentication server.