Cryptanalysis of Dynamic Identity Based on a Remote User Authentication Scheme for a Multi-server Environment
Chung-Huei Ling, Wan-Yu Chao, Shih-Ming Chen, Min‐Shiang Hwang · 2015
It’s an important research issue in a remote user authentication scheme for a multi-server environment. Recently, Li et al. proposed a scheme to remedy Lee et al.’s scheme to avoid the forgery attack, server spoofing attack and changing password easily. However, we find that Li et al.’s scheme is insecure against a server spoofing attack.