VANET中基于无证书环签密的可认证隐私保护方案  

Authenticated Privacy Protection Scheme Based on Certificateless Ring Signcryption in VANET

作　　者：赵楠 章国安[1] ZHAO Nan;ZHANG Guo-an(School of Information Science and Technology,Nantong University,Nantong,Jiangsu 226019,China)

机构地区：[1]南通大学信息科学技术学院

出　　处：《计算机科学》2020年第3期312-319,共8页Computer Science

基　　金：国家自然科学基金青年科学基金(61801249)~~

摘　　要：针对车载自组织网络(Vehicular ad-hoc Network,VANET)中车辆用户隐私信息保护和通信消息传输安全的问题,提出了一种可认证的无证书环签密方案。车辆通过可信机构生成的伪身份通信,有且仅有可信机构可以根据车辆节点的原始注册信息和追踪密钥确定消息发送车辆的真实身份,保证了通信的匿名性和对恶意车辆身份的可追踪性;消息发送车辆和接收车辆基于所构建的可认证环签密模型分别执行签密和解签密算法,实现了签密车辆身份和所发送消息的可认证;在随机预言模型下证明了所提方案具有机密性和不可伪造性。将所提的隐私保护方案与现有的VANET隐私保护方案进行安全性能的比较,证明了所提方案的机密性、可认证性和可追踪性等安全性较完善。通过列表比较了所提方案中环签密和解签密算法中各项运算的数量。将两种算法中双线性运算和标量乘运算的开销之和作为所提方案的计算开销,列表并进行数值分析。仿真实验基于Intel I7、3.07 GHz的硬件平台和MATLAB软件。结果表明,所提方案的计算开销远小于其余3个方案。当车辆数量增大到适用范围的上限100时,所提方案的计算开销仍小于150 ms。因此,该隐私保护方案满足了安全性和即时通信的要求,尤其适用于城市交通系统。Aiming at the protection of vehicle users’privacy information and the security transmission of communication messages in the vehicle ad-hoc networks,an authenticated certificateless ring signcryption scheme was proposed.The vehicles communicated with others through their pseudo-identities generated by the trusted authority,and the real-identity of the vehicle can only be determined by the trusted authority according to the original registration information of the vehicle node and the tracing keys,which ensures the anonymity of the communication and traceability of the malicious vehicles.The signcryption and decryption algorithms are implemented respectively by message sending vehicle and receiving vehical based on the proposed authenticated certificateless ring signcryption model,which results in the achievement of the identity authentication of the signcryption vehicle and authentication of sending messages.The confidentiality and unforgeability of the proposed scheme can be proved under the random oracle model.Compared with the existing privacy-protection schemes of VANET,the security performance of the proposed scheme is more perfect in terms of confidentiality,authentication and traceability.Through the lists,the number of operations in the ring signcryption and decryption algorithms of the scheme are compared.The sum overhead of bilinear operations and scalar multiplications is treated as the computational overhead of the scheme,and is listed and analyzed numerically.The simulations of the scheme are based on Intel I7,3.07 GHz hardware platform and MATLAB software.The results show that the computational overhead of the proposed scheme is far less than the other three.When the number of vehicles increases to 100,the upper limit of the applicable range,the computational overhead of the proposed scheme is still less than 150 ms.Therefore,the proposed privacy protection scheme has satisfied the requirement of security and instant messaging,especially suitable for urban transportation systems.

关 键 词：车载自组织网络 无证书密码体制 环签密 认证 隐私保护 可追踪性 效率 

分 类 号：TN918.4[电子电信—通信与信息系统]