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Vulnerabilities of Wu-Chieu's Improved Password Authentication Scheme Using Smart Cards
Wei-Chi KU Hsiu-Mei CHUANG Maw-Jinn TSAUR
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/11/01
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Information Security
cryptography, password authentication, forgery attack, smart card,
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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.