An Enhanced Authentication Scheme with Anonymity for Roaming Service in Global Mobility Networks

Most recently, Chang et al proposed an authentication scheme with anonymity for roaming service in global mobility networks. Unfortunately, the scheme was still found insecure by Youn et al. However, they did not present any countermeasures to fix its security weaknesses. In this paper, we propose such an enhanced scheme that can remedy the security loopholes existing in Chang et al´s scheme while the merits of the original scheme are left unchanged. In addition, we consider a lot from practical aspects in our scheme. Therefore, the end result is a secure and efficient user authentication scheme well-suited to roaming service in global mobility networks.