Just finished reading an interesting article on Single Sign-On in GSM / UMTS environments . . . The article focuses on Single Sign-On protocols a la Liberty Alliance in GSM and UMTS environments. It provides the details of two protocols, one for GSM and one for UMTS. Both of these use a secret key, say Ki, stored in the SIM card and shared with the Public Land Mobile Network (PLMN) operator:
A. Pashalidis and C. J. Mitchell, "Using GSM/UMTS for single sign-on". in: Proceedings of SympoTIC '03, Joint IST Workshop on Mobile Future and Symposium on Trends in Communications, Bratislava, Slovakia, October 2003, IEEE Press, 2003, pp. 138-145.
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