VANET中基于SM9密码算法的聚合签名方案

AGGREGATE SIGNATURE SCHEME BASED ON SM9 CRYPTOGRAPHIC ALGORITHM IN VANET

针对车辆自组织网络(VANET)中存在的车辆隐私泄露和信息认证过程复杂的问题,基于国产密码SM9算法设计一种新的聚合签名方案。SM9密码算法是基于身份的密码体制,解决了公钥密码体制中证书管理和密钥托管的问题。利用假名代替车辆的真实身份参与整个签名过程,从而很好地保护了车辆的隐私。认证过程利用了聚合签名技术,实现了批量验证,大大提高了认证的效率。在随机预言机(Random Oracle)模型下,证明了方案在适应性选择消息和身份攻击下是抗存在性伪造的。与相关文献的方案相比,该方案在保证安全性的前提下,具有较高的性能,更加适用于VANET。

Aiming at the problems of vehicle privacy leakage and complex information authentication process in VANET,this paper designs a new aggregation signature scheme based on SM9 algorithm.SM9 cryptosystem is an identity-based cryptosystem,which solves the problems of certificate management and key escrow in public key cryptosystem.The pseudonym was used to replace the real identity of the vehicle to participate in the whole signature process,thus the privacy of the vehicle was well protected.The authentication process used aggregate signature technology to realize batch verification and greatly improved the efficiency of authentication.In the random oracle model,it is proved that the scheme is resistant to existential forgery under adaptive selection message and identity attack.Compared with the related literature,this scheme has higher performance on the premise of ensuring security,and is more suitable for VANET.