Three Factor Authenticated Key Agreement Scheme for Telecare Medicine Information System Using Chebyshev Chaotic Maps

Telecare Medicine Information System (TMIS) is an effective technology in which patients can remain at their home and can get suggestions for medical treatment through the internet. One of the challenges faced by this system is security of medical data. Hence mutual authentication and session key establishment on a medical server between doctor and a patient are required for enhancing security of TMIS. Password authentication schemes have been widely used as a security scheme in TMIS. Most of the Password authentication schemes are associated with chaotic map. However, they are vulnerable to various attacks such as offline password guessing attack, man-inthe-middle attack, stolen smart card attack etc. The Objective of this work is to provide medical data security, privacy and user access authentication. It shows that, the biometrics based password authentication scheme using extended chaotic maps had been used, which secured TMIS from vulnerable attacks such as outsider attack, impersonation attack and replay attack in the existing system. Though it provides user anonymity, forward secrecy and session key security, it does not consider about privacy protection. The proposed system introduces three factor (password, smart card and biometrics) authenticated key agreement scheme using chebyshev chaotic map to provide privacy protection. The proposed system enhances the security of TMIS against vulnerable attacks such as man-inmiddle attack, replay attack and provides various features such as user anonymity, perfect forward secrecy, efficient login and password updating.