An Improved User Authentication and Key Agreement Scheme for Multi-medical Server Usable in TMIS

Abstract

Recently, Amin and Biswas proposed a novel authentication protocol for TMIS. They claimed that their protocol provides security protection on the attacks proposed by them. Even though Amin and Biswas’s protocol achieves efficiency, we demonstrate that their protocol is insecure against many attacks. To overcome the defects in Amin and Biswas’s protocol, we proposed an improved user authentication scheme in TMIS. The security analysis shows that the proposed protocol remedies the weaknesses in Amin and Biswas’s protocol.