Cryptanalysis of Security Enhancement for a Modified Authenticated Key Agreement Protocol
Kou Min Cheng, Ting‐Yi Chang, Jung Wen Lo · 2010
Recently, Chang et al. proposed a security enhancement in Ku and Wang’s authenticated key agreement protocol. Two parties employ the pre-shared password to agreement a common session key via insecure network. However, in this article, we will show that Chang et al.’s scheme is suffer from the backward replay attack and the off-line password guessing attack.