Cryptanalysis of the Modified Remote Login Authentication Scheme Based on a Geometric Approach

Authors:
Chin-Chen Chang;Iuon-Chang Lin
Affiliations:
Department of Computer Science and Information Engineering, National Chung Cheng University, 160, San-Hsing, Min-Hsiung, Chiayi 621, Taiwan, e-mail: ccc@cs.ccu.edu.tw;Department of Management Information System, National Chung Hsing University, 250 Kuo Kuang Road, 402 Taichung, Taiwan, e-mail: iclin@cs.kuas.edu.tw
Venue:
Informatica
Year:
2005

Citing 3
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Abstract

In 1995, Wu proposed a remote login authentication scheme based on geometric approach. However, Chien, Jan and Tseng presented a cryptanalysis of Wu's scheme to show that it is not secure. Moreover, they proposed a modified version of Wu's scheme. This paper presents there is a serious weakness in this modified remote login authentication scheme. We show that an illegal user can easily forge a valid login request in the modified version proposed previously.