Symbolic Logic, Inc.
Secure Re-use of SIM Security Parameters between Different Partiest Parties

Abstract:

Various arrangements for using a SIM card across multiple wireless networks are presented. A DKi value may be stored by the SIM card. The SIM card may calculated a FKi value using the DKi value and a stored BKi value. The SIM card can attach to a guest wireless network. A challenge may be received by the SIM card from the guest wireless network. The SIM card may calculate an answer to the challenge using the FKi value. The answer may be transmitted to the wireless network. In response to the answer being correct, the wireless device having the SIM card installed is successfully authenticated to use the wireless network.