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Recently Lu et al. proposed a modified anonymous two-factor authenticated key exchange protocol to eliminate the security weaknesses of Xie et al.'s scheme. They hence claimed that their scheme is immune to possible well-known attacks. However, we found that Lu et al.'s protocol is still insecure against the outsider attack, user impersonation attack, and off-line password guessing attack. To overcome...
Recently, numerous extended chaotic map-based password authentication schemes that employ smart card technology were proposed for Telecare Medical Information Systems (TMISs). In 2015, Lu et al. used Li et al.’s scheme as a basis to propose a password authentication scheme for TMISs that is based on biometrics and smart card technology and employs extended chaotic maps. Lu et al. demonstrated that...
Remote user authentication scheme is one of the most convenient authentication schemes to deal with secret data via insecure communication channel. During the last couple of decades, many researchers have proposed a remote user authentication schemes which are ID-based, password-based, and smart card-based. Above all, smart card-based remote user authentication schemes for multi-server environment...
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