An Efficient Smart card based Remote User Authentication Scheme using hash function

Remote user Authentication is a way to restrict access to only those users that are legitimate for remote access. The authentication mechanism is cryptography technique to protect unauthorized access of a network system. Recently, more efficient ID-based and password authentication schemes are proposed by, H.T. Liaw, Wang and Xu R. Song, however, Liaw´s and Wang´s scheme are vulnerable to offline password attack and server masquerade attack parallel session attack. Xu´s scheme is vulnerable to an impersonation attack and R. Song´s Scheme is vulnerable to insider attack, lack of perfect forward security for session keys and denial-of-service attack. In 2010 S.K. Sood proposed an improvement of Liao et al´s scheme. However, this scheme did not provided mutual authentication and maintaining database for verification of the legitimate user. In this paper, we analyze few attacks and finally propose an Efficient Smart card based Remote User Authentication Scheme. The proposed scheme resists most of the current possible attack and provides the essential security requirements.