A modified remote user authentication scheme using smart card based on ECDLP

In this paper, a modified of Jena [1] remote user authentication scheme using smart cards based on Elliptic Curve Discrete Logarithm Problem (ECDLP) has been proposed. A remote user authentication scheme is a two-party protocol whereby an authentication server confirms the identity of a remote individual logging on to the server over an untrusted, unsecured network. The password based authentication schemes are commonly used for authenticating remote users. Many passwords based schemes both with and without smart card have been proposed; each scheme has its merits and demerits. However, the scheme proposed by Jena is vulnerable to the masquerade attack. In this paper, we shall discuss the masquerade attack on their scheme. Furthermore, we shall present an enhanced scheme for preventing the above attack.