An improved secure dynamic ID-based remote user authentication scheme with key agreement using symmetric cryptology

Abstract

A dynamic ID-based user authentication scheme is designed to protect leakage of a user's partial information from intruders while enabling authenticated users to be granted access to the network service. In 2012, Wen and Li proposed a dynamic ID-based remote user authentication scheme with key agreement and claimed that their scheme resisted impersonation attacks and avoided leakage of partial information. However, Kim, et al., described that Wen and Li's scheme could leak some key information to an adversary and is vulnerable to a man-in-the-middle attack launched by any adversary. In this paper, we show how to solve the vulnerabilities in Wen and Li's scheme.