ROBUST DYNAMIC ID-BASED REMOTE MUTUAL AUTHENTICATION SCHEME

Dynamic ID based authentication scheme is more and more important in insecure wireless environment and system. Two of kinds of attack that authentication schemes must resist are stealing identity and reflection attack which is a potential way of attacking a challenge- response authentication system using the same protocol in both direc­tions. It must be guaranteed to prevent attackers from reusing informa­tion from authentication phase and the scheme of Yoon and Yoo satisfies those requirements. However, their scheme can not resist insider and impersonation attack by using lost or stolen smart card. In this paper, we demonstrate that Yoon and Yoo’s scheme is still vulnerable to those attacks. Then, we present an improvement to their scheme in order to isolate such problems

Cryptanalysis for Secure and Efficient Smart-Card-Based Remote User Authentication Scheme for Multi-server Environment

Multi-server authentication is going to be an integral part of remote authentication with the passage of time. The remote authentication has been part and parcel of internet based communication. In the last decade several multi-server authentication techniques has been presented. However there is still a need of more efficient and robust techniques. Lately, Saraswathi et al., presented a multi-server authentication scheme that has been found under much vulnerability like stolen card attack, misrepresentation attack, and forward secrecy attacks. This paper presents the cryptanalysis for Saraswathi et al. scheme and shows the review analysis