Abstract
The Global System for Mobile Communication (GSM) is widely regarded as the convenient digital mobile communication systems. However, many problems arise relating to data confidentiality, user privacy, and computational load. In the chapter 3 of this thesis, we provide some solutions to address problems, and do not change the GSM architecture. We also provide anonymous channel for user location privacy. One of our basic objects is to construct anonymous environment in wireless cellular networks and then we would apply it to the third generation mobile communication system or the novel communication system. In the chapter 4 of this thesis, three secure and anonymous authentication protocols are proposed for cellular mobile system: The first one is for call set-up, the second one is for hand-off, and last one is an anonymous call. We utilize the Rabin’s cryptosystem to construct a mutual authentication protocol on call set-up procedure. It can reduce computation load on mobile encrypting the message and provide mobile subscribers with user identity privacy. In hand-off procedure, we provide a protocol to protect mobile against BS spoofing. Finally, we construct a conference key distribution system based on Elliptic Curve Cryptosystem (ECC for short) [1]. In many applications, the attendees of a conference should be anonymous to each other (expect to the conference initiator who choose the attendees). Furthermore, we propose an anonymous conference protocol for mobile system.