Attacks on Young-Hwa An’s Improved Dynamic ID-Based Remote User Authentication Scheme
Cheng Qiang Xu, Zhen Li Zhang · Applied Mechanics and Materials · 2014
In 2011, Khan et al. analyzed and improved an enhanced secure dynamic ID-based remote user authentication scheme to overcome the weakness of Wang et al.’s scheme. In 2013, Young-Hwa An showed that Khan et al.’s scheme is not secure because Khan et al.’s scheme can not resist password guessing attack, forgery attack and does not provide user anonymity. After that he proposed a security improvement of dynamic ID-based remote user authentication scheme with session key agreement to remedy the weakness in Khan et al.’s scheme. Recently, through our study, we have found that Young-Hwa An’s mechanism is not secure enough. There still exists insider user’s attack, anonymity attack and forgery attack.