Patent ID: 8582762

Claim:
A method, comprising: producing, by a mobile station, authentication information by performing an authentication procedure with a communication system, the authentication procedure performed through a path external to a second system; exchanging, by the mobile station and through a route external to the communication system, key generation information comprising a shared secret with the second system and wherein the shared secret is not known to the communication system, said exchanging the key generation information comprises providing a time value of a transmission initiated by the mobile station for performing at least one of: issuing an error message and interrupting said exchanging by the second system, if a delay of said transmission received by the second system exceeds a threshold value; and generating, by the mobile station, a communication key to communicate with the second system using at least in part the authentication information and the key generation information to establish a communication of the mobile station with the second system using said communication key generated by the mobile station and a second communication key generated by the second system using at least in part the key generation information and said authentication information requested and received by said second system from the communication system, wherein the communication system comprises at least one base station and the second system comprises at least one server node.