Robust and Simple Multi-server Authentication Protocol without Verification Table

Authors:
Hongfeng Zhu;Tianhua Liu;Jie Liu
Affiliations:
-;-;-
Venue:
HIS '09 Proceedings of the 2009 Ninth International Conference on Hybrid Intelligent Systems - Volume 03
Year:
2009

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Abstract

Recently, Tsai et al. have proposed a multi-server authentication protocol. They claimed their protocol is secure and can withstand various attacks. But we found some security loopholes in the protocol. Accordingly, the current paper demonstrates that Tsai’s protocol does not provide perfect forward secrecy and is susceptible to a Denning-Sacco attack and Server spoofing. We then present an enhanced protocol to isolate such problems.