摘要： 车载自组网（VANET）能提高智能交通系统的安全性和道路通行效率，然而网络通信环境的开放性使其容易遭受攻击进而引发各种安全问题。针对VANET中的隐私泄露和签名验证效率较低等问题，结合基于身份的密码体制和聚合签名技术，设计一个面向VANET的消息认证方案，将多个消息的认证聚合为一个短签名，车辆只需对聚合后的签名进行验证，即可快速判断所有签名的有效性。分析结果表明，在随机预言模型下，该方案的安全性规约于计算Diffie-Hellman困难问题，且能有效缩短车辆对通信消息的认证响应时间。

关键词: 车载自组网, 聚合签名, 基于身份的签名, 消息认证, 可证明安全性

Abstract: Vehicular Ad Hoc Network(VANET) can improve security of intelligent transportation systems and traffic efficiency,but an open network communication environment makes the system vulnerable to attacks,causing various security issues.To address privacy disclosure and inefficient signature verification in VANET,this paper proposes a message authentication scheme for VANET.The scheme integrates an identity-based cryptosystem with aggregate signatures,so as to aggregating authentication of multiple messages into a short signature.Thus vehicles can rapidly assert the validity of all signatures by verifying only aggregated signatures.Analysis results show that under the random prediction model,the security of the proposed scheme can be reduced to the calculation of the difficult Diffie-Hellman problem,and it can efficiently reduce the authentication response time of vehicles to communication messages.

Key words: Vehicular Ad Hoc Network(VANET), aggregate signature, identity-based signature, message authentication, provable security

中图分类号: 

• TP309