Security Enhanced Anonymous Multi-Server Authenticated Key Agreement Scheme using Smart Card and Biometrics

Chuang and Chen propose an anonymous multi server authenticated key agreement scheme based on trust computing using smart card, password, and biometrics. Chuang and Chen say that this scheme not only supports multi-server but also achieves security requirements. but this scheme is vulnerable to masquerade attack, smart card attack, DoS attack and insufficient for perfect forward secrecy. To solve problems, this paper proposes security enhanced anonymous multi server authenticated key agreement scheme using smart card and biometrics

Cryptanalysis and Improvement on Robust Three-Factor Remote User Authentication Scheme with Key Agreement for Multimedia System

A three-factor authentication combines biometrics information with user password and smart card to provide security-enhanced user authentication. An proposed user authentication scheme improved Das’s scheme. But An’s scheme is not secure against denial of service attack in login phase, forgery attack. Li et al. pointed out them and proposed three-factor remote user authentication scheme with key agreement. However, Li et al’s scheme still has some security problem. In this paper, we present a cryptanalysis and improvement of Li et al.’s remote user authentication scheme