资料介绍：

Further Security Enhancement for Optimal Strong-Password Authentication Protocol
Tzung-Her Chen, Gwoboa Horng,
Wei-Bin Lee ,Kuang-Long Lin
                                                                 
                                                                 3/27/2004

Outline
Introduction
Review of Ku-Chen scheme
The problem of Ku-Chen scheme
The proposed scheme
Security Analysis
Conclusions
Introduction
In 2000, Sandirigama et al. proposed SAS scheme lowered storage, processing, and transmission overheads.
In 2001, Lin, Sun, and Hwang proposed an enhanced password authentication scheme, called the OSPA.
Introduction
In 2002,OSPA protocol has been shown vulnerable to the stolen-verifier attack and the impersonation attack.
In 2003, Ku and Chen proposed a new improved version for the OSPA protocol
In this paper, an improved scheme with mutual authentication is proposed.
Review of Ku-Chen scheme
Notation:
      h(.) : collision-resistant hash function
        T   : login times
        k   : long-term secret key
          : exclusive-or operation


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