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Cryptanalysis and Improvement of User Authentication Scheme using Smart Cards for Multi-Server Environments

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2 Author(s)
Zhen-Fu Cao ; Dept. of Comput. Sci. & Technol., Shanghai Jiao Tong Univ. ; Da-Zhi Sun

For providing the login service in multi-server environments, Fan, Xu, and Li presented a remote user authentication scheme using smart cards. In this paper, we demonstrate that Fan-Xu-Li's scheme is vulnerable to the parallel session attack. That is, when a legal user logs in a server, an adversary without knowing any secret information can easily impersonate the user to log in other authorized servers. It means that a serious security flaw exists in Fan-Xu-Li's scheme. In addition to being practical, it is desirable to avoid relying on timestamps for security in their scheme. We therefore propose an improved scheme to overcome above disadvantages. As a unilateral authentication mechanism, our improved scheme is more suitable for real-life cryptographic applications than Fan-Xu-Li's scheme

Published in:

Machine Learning and Cybernetics, 2006 International Conference on

Date of Conference:

13-16 Aug. 2006

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