An improved biometrics based authentication scheme using extended chaotic maps for multimedia medicine information systems

With the increase of security requirements, numerous biometrics based authentication schemes that apply the smart card technology are proposed for multimedia medicine information systems in the last several years. Recently, Lu et al. presented a biometrics based authentication and key agreement scheme using extended Chebyshev chaotic maps. Unfortunately, we find that their scheme is still insecure with respect to issues such as flaws in the both login phase and password change phase. And we show that their scheme is vulnerable to the Denial-of-Service attack, user impersonation attack and server masquerade attack, which also fails to achieve the user anonymity. In order to remedy these weaknesses, we retain the useful properties of Lu et al.’s scheme to propose a robust biometrics based authentication and key agreement scheme for multimedia medicine information systems. The informal and formal security analysis of our scheme are given respectively, which demonstrate that our scheme satisfies the desirable security requirements. Furthermore, the proposed scheme provides some significant features which are not considered in most of the related schemes, such as, biometric information protection and user re-registration or revocation. Thus, our scheme resists the known attacks and is efficient for practical applications in the multimedia medicine information systems.