International Journal of Computer Applications
Remote User authentication protocol is used for verifying the legitimacy of a remote user over insecure network environments. Recently, many secure ID based remote user authentication scheme using smart card have been proposed in the literature. In 2012, they proposed secure ID based remote user authentication scheme using smart card and claimed that their scheme can avoid all types of security flaws and feasible in terms of computation and storage cost. But the authors have pointed out that their scheme is insecure against user impersonation attack, server masquerading attack, off-line password guessing attack, off-line identity guessing attack, session key recovery attack and smart card stolen attack.