Security Enhanced Dynamic ID based Remote User Authentication Scheme for Multi-Server Environments

Multi-server environments are that the user registers the single registration server and since the user uses the service to authenticate on multi-server. For this, many user authentication schemes have been proposed for multi-server environments. In 2013, Li, et al., proposed dynamic ID based remote user authentication scheme for multi-server environments. Unfortunately, their scheme is vulnerable to forgery attacks and replay attacks. In this paper, we analyze the security vulnerabilities of Li et al.’s scheme, and propose dynamic ID based remote user authentication scheme for multi-server environments. The proposed scheme ensures the safety to various attacks such as forgery attacks and replay attacks. Just like the existing schemes, our scheme is efficient at using the hash function and exclusive-OR operation.