An Improved User Authentication Protocol Based on Chaotic Maps for Multiserver Environment

Now-a-days researchers have focused on designing authentication schemes using smart card because of advancement in computer and communication technologies. Recently, Li et al. have discussed a protocol for multiserver environment based on chaotic maps. We analyze its security and find that it is not resistant to the privileged insider and smart card loss attacks besides user anonymity. Here, we propose an improved user authentication protocol for multiserver environment using the chaotic maps to overcome these limitations. We formally prove using BAN logic that our protocol provides mutual authentication. We show its formal security analysis using random oracle and discuss its informal security analysis to show that it is resistance to the various known attacks. We simulate our protocol using AVISPA tool to verify its security against active and passive attacks. Our protocol is more secure than the existing protocols.