An Efficient and Robust Chaotic Map Based Authentication Scheme for Telecare Medicine Information Systems

Abstract

Telecare medicine information system (TMIS) provides a convenient and efficient communicating platform for patients at home and physicians at medical clinics. To protect the information of patients and servers secret, a series of authentication schemes for TMIS have been proposed. Recently, Debasis et al. proposed an RSA-based remote user authentication for TMIS. Meanwhile, they claimed that their scheme can resist various attacks. Unluckily, after analyzed Debasis et al.’s scheme, we find that their scheme cannot resist some attacks. Besides, if an adversary has guessed the patient’s password, he/she can compute the session key between the patient and server. In order to enhance the security of authentication scheme for TMIS, we propose a new scheme based on extended chaotic map. Compared with the previous schemes, our scheme not only possesses robust security, but also has better efficiency.