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Chen et al. proposed in 2012, a dynamic ID-based authentication scheme for Telecare Medical Information Systems. Chen et al. preferred simpler computations unlike previous schemes proposed for TMIS, so they designed a computational complexity-free protocol. But it entails many security concerns. Here we show that an adversary can cheat the lawful participants of the scheme, can compute the agreed...
In 2008, Khan et al. proposed a remote user authentication scheme on mobile device, using hash-function and fingerprint biometric. In 2010, Chen et al. discussed some security weaknesses of Khan et al.'s scheme and subsequently proposed an improved scheme. Recently, Truong et al. have demonstrated that in Chen et al.'s scheme, an adversary can successfully replay an intercepted login request. They...
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