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Seamless roaming over wireless networks is highly desirable to mobile users, and security such as authentication of mobile users is challenging. In this paper, the authors propose a privacy-preserving universal authentication protocol, called Priauth, which provides strong user anonymity against both eavesdroppers and foreign servers, session key establishment, and achieves efficiency. Most importantly, Priauth provides an efficient approach to tackle the problem of user revocation while supporting strong user untraceability. Mobile handled devices (e.g., notebook computer, PDA and smart phone) in wireless networks are gradually changing the way the people live their life. For allowing people to get connected seamlessly using their devices without being limited by the geographical coverage of their own home networks, a roaming service should be deployed.
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