A remark concerning m-divisibility and the discrete logarithm in the divisor class group of curves
Mathematics of Computation
A One Round Protocol for Tripartite Diffie-Hellman
ANTS-IV Proceedings of the 4th International Symposium on Algorithmic Number Theory
A Remote Authentication Scheme Preserving User Anonymity
AINA '05 Proceedings of the 19th International Conference on Advanced Information Networking and Applications - Volume 2
More Efficient and Secure Remote User Authentication Scheme using Smart Cards
ICPADS '05 Proceedings of the 11th International Conference on Parallel and Distributed Systems - Workshops - Volume 02
An improved bilinear pairing based remote user authentication scheme
Computer Standards & Interfaces
A dynamic ID-based remote user authentication scheme
IEEE Transactions on Consumer Electronics
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User authentication technologies that provide the anonymity of users have been proposed according to increase in the need for security of personal information and privacy protection in ubiquitous computing environments. Studies on smart card-based authentication systems have been actively conducted. In 1993, Chang and Wu first proposed a smart card-based remote user authentication system. In 2005, Das et al. proposed a remote user authentication scheme using bilinear pairings. In the Das et al.'s scheme, it prevents many logged in users with the same login-ID and provides a flexible password change option to the registered users without any help of the remote system. In this paper, it shows the weakness of the Das et al.'s scheme for an impersonation attack using the Euclidean algorithm in the login process. This paper proposes an improved scheme that shows more safe and effective figures than the scheme proposed by Das et al.'s scheme.