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This paper points out certain weaknesses in the existing security system of Global System of Mobile Communications (GSM) and proposes a better security system for GSM. The proposed security provides an authenticated session key distribution protocol between the Authentication Center (AUC) and the Mobile Station (MS) for every call attempt made by a MS. At the end of an authenticated session key distribution protocol, the identities are mutually verified between the AUC of a Public Land Mobile Network (PLMN) and the Subscriber Identity Module (SIM) of a MS as well as the session key for call encryption is distributed to the MS.
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