Date Added: May 2010
The weakness of an exquisite authentication scheme based on smart cards and passwords proposed by Liao et al. [C. H. Liao, H. C. Chen, and C. T. Wang, An Exquisite Mutual Authentication Scheme with Key Agreement Using Smart Card, Informatica, Vol. 33, No. 2, 2009, 125-132.] is analyzed. Five kinds of weakness are presented in different scenarios. The analyses show that Liao et al.'s scheme is insecure for practical application. Remote authentication is a method to authenticate remote users over insecure communication channel. Password-based authentication schemes have been widely deployed to verify the legitimacy of remote users. Recently, many password authentication schemes using smart cards have been proposed by some researchers.