A Novel Remote Authentication Scheme Based-On Password for Anonymous Users

Abstract

Security of data communication becomes a crucial challenge due to the rapid development of computer and information technologies. To ensure security of resource transmission, engineers have proposed numerous schemes for protection. Anonymity is one of the important properties of remote authentication schemes to preserve user privacy. Besides, it can avoid unauthorized entities from using the user ID and other intercepted information to forge legal login messages. In 2009, Wang et al. proposed a dynamic ID-based remote user authentication scheme without any verification table which provides user anonymity and resists stolen-verifier and DOS attacks. However, Khan et al. pointed out that Wang et al.’s scheme cannot achieve user anonymity. Further, Khan et al. proposed an improved scheme to overcome the mentioned defect. In this paper, we demonstrate that Khan et al.’s scheme is vulnerable to stolen-verifier and DOS attacks and propose a new authentication scheme without any verification table. The proposed scheme not only achieves user anonymity but also resists replay, stolen-verifier, and DOS attacks.