Patent ID: 8514851

Claim:
A method of operating a home agent to establish a secured information packet communication between a mobile node in a first network and the home agent in a second network, the method comprising: receiving, at the home agent in the second network, a binding update message from the mobile node in the first network, the binding update message containing a first authenticator data element, the first authenticator data element generated using a first algorithm and a first shared secret; sending an authentication request message, that includes the first authenticator data element, to an authentication server on the second network effective to cause the authentication server to derive the first shared secret from the first authenticator data element and to generate a second shared secret using a second algorithm and the first shared secret; receiving an authentication response message from the authentication server, the authentication response message including the second shared secret; generating a second authenticator data element using the second shared secret; and sending a binding acknowledgement message to the mobile node, the binding acknowledgement message containing the second authenticator data element.