一种对简单鉴别密钥协定的修正算法

A Modified Algorithm of the Simple Authenticated Key Agreement

简单鉴别密钥协定(SAKA)是一种基于密码的、高效的鉴别密钥交换协议,但是它存在着3个严重的安全缺陷:1不能确认用户的身份;2不能防止字典攻击;3不能提供完美前向安全(PFS).提出了一种修正算法,在不增加复杂度的情况下克服了SAKA协议的缺陷.对新的修正算法进行了安全性分析.

The simple authenticated key agreement (SAKA) is a passwordbased and efficient authenticated key exchange protocol. The weaknesses of the SAKA include ① it cannot detect a masquerade, ② it cannot withstand the dictionary attack, and ③ it cannot provide a perfect forward security. This paper improved the SAKA algorithm to overcome these weaknesses without increasing complexity. Besides, it gave the analysis of the improved scheme.