Publication IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer SciencesVol.E88-ANo.11pp.3241-3243 Publication Date: 2005/11/01 Online ISSN: DOI: 10.1093/ietfec/e88-a.11.3241 Print ISSN: 0916-8508 Type of Manuscript: LETTER Category: Information Security Keyword: cryptography, password authentication, forgery attack, smart card,
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Summary: In 2003, Wu and Chieu proposed a scheme that was claimed to be an enhanced version of Sun's password authentication scheme. Recently, Wu and Chieu themselves showed that their scheme is vulnerable to a forgery attack and then proposed an improved scheme. Herein, we demonstrate that Wu-Chieu's improved scheme is still vulnerable to several attacks.