Cryptology ePrint Archive: Report 2004/163

On the Weaknesses and Improvements of an Efficient Password Based Remote User Authentication Scheme Using Smart Cards

Manoj Kumar

Abstract: In 2002, Chien et al. proposed an efficient remote user authentication scheme using smart cards. Later, in 2004, W. C. Ku and S. M. Chen pointed out some attacks on Chien et al.ís scheme. W. C. Ku and S. M. Chen also proposed a modified scheme to prevent the attacks on Chien et al.ís scheme. This paper discusses the security of the W. C. Ku and S. M. Chenís scheme. This paper aims to show that the modified scheme is still vulnerable to the password guessing attack and the insider attack.

Category / Keywords: Cryptography, Cryptanalysis, Network security, Remote user authentication, Smart card, Password, Reflection attack, Password guessing attack and Insider attack.

Publication Info: Not Published

Date: received 8 Jul 2004, withdrawn 26 Sep 2004

Contact author: chayayamu at yahoo co in

Available format(s): (-- withdrawn --)

Version: 20040926:172642 (All versions of this report)

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