Patent ID: 8295488
Filing Date: 2012-10-23
Classification: H04L,H04W

Abstract:
1. A method for arranging security for a communications network, the method comprising: deriving a first session key at a mobile terminal based upon a root key that is shared by the mobile terminal and a security node; receiving a handoff initiation command and information relating to derivation of a second session key at the mobile terminal from a first access node; requesting, via the mobile terminal, session context information from the security node if a second access node does not have the second session key for communication with the mobile terminal; deriving, via the mobile terminal using a processor, the second session key based at least on the root key, the information relating to derivation of the second session key, and a part of identity information of the second access node; encrypting at least a first part of a message with the first session key at the mobile terminal for transmission of the message to the second access node; and encrypting at least a second part of the message with the second session key at the mobile terminal for transmission of the message to the second access node.