Anonymous Authentication without Home Server in Mobile Roaming Networks

In this paper, we propose an anonymous authentication protocol based on group signature under Canetti-Krawczyk (CK) model for mobile roaming networks. The protocol involves only a mobile user and the user's visited server, without the involvement of the user's home server until the user's identity (ID) needs to be revealed. In order to reduce the computational burden on the mobile terminals, the protocol gives a method that minimizes expensive pairing operations. Then, its performance as well as efficiency is analyzed. It is shown that the proposed protocol greatly reduces the average authentication latency while security and anonymity are still preserved. Therefore, it can be applicable in practical applications.