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   Vol.E88-A   No.11   pp.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
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.