中文摘要：

利用标准模型下的单跳代理重签名技术,提出一个可追溯的车载自组网（VANET）隐私保护认证协议,其中,交通管理中心TRC授权路边单元RSU作为代理,将车载单元OBU签名的消息以TRC的名义进行代理重签名,从而防止根据签名追踪OBU,并能在TRC的协助和授权下,进一步通过RSU的配合准确快速地追溯消息签名的真实产生者。数字签名和时间戳技术的应用使协议能够抵御伪造消息和重放消息攻击。分析结果表明,该协议能够达到VANET条件隐私的目标,满足标准模型下代理重签名的安全性要求,与其他经典协议相比,存储开销更小,运行效率更高。

英文摘要：

This paper introduces a traceable privacy-preserving authentication protocol for VehicularAd-hoc Network（VANET） based on a single hop Proxy Re-signature（PRS） in the standard model.It achieves some good features： The TRC designates the RSU translating signatures computed by the OBU into one which validness can be verified by the TRC’s public key.Therefore,it is prevented that vehicles are traced by their signatures on the messages,and attacks are thwarted by using an endorsement mechanism based on signatures.Security analysis shows that the protocol can achieve good conditional privacy target of VANET.Performance analysis shows that the protocol can also provide an efficient way to relieve workload by less storage and communication cost compared to the other classic protocols.