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In 2005, Yoon et al. proposed a remote user authentication scheme using smart card. In 2009, Li pointed out that Yoon et al.'s scheme can't against denial of service attack and performs only unilateral authentication (only user authentication). He improved Yoon et al.'s scheme and claimed that the improved scheme can eliminate the vulnerability. However, we found Li's scheme is vulnerable to malicious...
Yang-Yang proposed a new key authentication scheme based on fuzzy extractor with Smart Card. The authors claimed their scheme can resist the guessing attack, the parallel attack, masquerade attack and other attack types. In this paper, we find that the scheme proposed by Yang-Yang was unable to resist the masquerade attack as they originally claimed.
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