关键词: 移动漫游, 匿名认证, 匿名追踪, CDH假设, 不可否认性

Abstract: With the widespread use of mobile devices, issues like roaming authentication and identification privacy become increasingly prominent. Many anonymous authentication protocols have been proposed in recent years. Among them, some schemes depend on a temporary identity instead of real identity and prevent attackers from tracking by updating authentication identities.Other schemes verify the identity of mobile terminals with the help of home server. However, these schemes generally have the problem of low authentication efficiency or increased authentication delay. In view of this, an anonymous roaming authentication scheme is proposed based on the idea of proxy signature. Mobile terminal generates proxy signature information by using the proxy authorization of the home server. Remote authentication servers can directly verify the identity of mobile terminals without the help of home server. Analysis shows that this scheme achieves security features such as anonymity of mobile terminal, nonrepudiation, unlikability and resistance to forgery attacks, while also reducing the computational load of and communication delay for the mobile terminal compared to existing schemes.

Key words: roaming authentication, anonymous authentication, anonymous traceability, CDH assumption, nonrepudiation