Analysis and Improvement of a User Authentication Improved Protocol

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Executive Summary

Remote user authentication always adopts the method of password to login the server within insecure network environments. Recently, Peyravin and Jeffries proposed a practical authentication scheme based on one-way collision-resistant hash functions. However, Shim and Munilla independently showed that the scheme is vulnerable to off-line guessing attacks. In order to remove the weakness, H?lbl, Welzer and Brumenn presented an improved secure password-based protocols for remote user authentication, password change and session key establishment. Unfortunately, the remedies of their improved scheme cannot work. The improved scheme still suffers from the off-line attacks.

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