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Remote user authentication is desirable for a Telecare medicine informationsystem (TMIS) to verify the correctness of remote users. In 2013, Jiang et al.proposed privacy preserving authentication scheme for TMIS. Recently, Wu and Xuanalyzed Jiang's scheme and identify serious security flaws in their scheme,namely, user impersonation attack, DoS attack and off-line password guessingattack. In this article, we analyze Wu and Xu's scheme and show that theirscheme is also vulnerable to off-line password guessing attack and does notprotect user anonymity. Moreover, we identify the inefficiency of incorrectinput detection of the login phase in Wu and Xu's scheme, where the smart cardexecutes the login session in-spite of wrong input.

Cryptanalysis of Wu and Xu's authentication scheme for Telecare Medicine Information Systems