Cryptanalysis of Security Enhancement for a Modified Authenticated Key Agreement Protocol

10.6633/IJNS.201007.11(1).08

Kou-Min Cheng；Ting-Yi Chang；Jung-Wen Lo

Cryptography ； information security ； key agreement ； key exchange ； password

International Journal of Network Security

11卷1期（2010 / 07 / 01）

55 - 57

英文

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.