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ASSistant Examiner James Seal (57) ABSTRACT In the method for establishing a Session key, a network and a mobile transfer codes between one another. The mobile and the network perform mutual authentication based on the codes. Besides performing this mutual authentication, the mobile and the network to establish the session key based on the codes. In one embodiment, the messages forming part of the intended Session are Sent with the codes, and form a basis upon which the codes for authentication have been derived.