Improved Authentication Scheme with Anonymity for Roaming Service in Global Mobility Networks

摘要

Recently Chang, Lee, and Chiu proposed an enhanced authentication scheme with anonymity for roaming service in global mobility networks. Their scheme is suitable for mobile environments. This is because it uses only low-cost functions such as one-way hash functions and exclusive-OR operations. After that, Youn, Park, and Lim showed the weaknesses of Chang et al.'s scheme without any countermeasures. In this paper, we propose an improved authentication scheme with anonymity by basing on low-cost functions as Chang et al.'s scheme. The proposed scheme overcomes the security flaws demonstrated by Youn et al. by adopting two secret values and a virtual identity. Therefore, our scheme is more secure and still efficient when compared with Chang et al.'s scheme.