Research On Privacy-preserving Authentication Scheme For Vanet

The development of science and technology is driving the prosperity of intelligent transportation systems,and currently vehicular ad-hoc network system is the most widely used intelligent transportation systems.The system relies on wireless communication technology,sensor technology,cloud computing and internet of things technology to provide network communication services between vehicles and everything around them,and plays an indispensable role in road safety and traffic control.With the intelligence of vehicular ad-hoc network system,the data security issues and traffic safety problems are becoming more and more serious.In the current privacy preservation schemes,vehicles communicate in the network using pseudonyms,which can safeguard the privacy of vehicles and drivers from being compromised.However,when an attacker holds a vehicle to launch various types of attacks resulting in traffic accidents,the network cannot be traced back to the attacker vehicle.In order to safeguard privacy data while achieving traceability,conditional privacy protection technologies have emerged.However,some of the existing conditional privacy protection schemes for vehicular ad-hoc network system still has security vulnerabilities.Therefore,it remains a challenge to guarantee conditional privacy security while ensuring system security with consideration of the limited computing and communication resources of the vehicle networking system.To address this problem,this research work analyzes existing schemes and proposes a secure and efficient conditional privacy protection scheme,as detailed below:(1)A security analysis of current privacy-preserving schemes for vehicular ad-hoc network system.Security analysis was performed for three papers,where Mitra Kazemi et al.’s scheme is identity-based,but it is not resistant to impersonation attacks;Hong Zhong et al.’s and Yulei Chen et al.’s schemes are based on certificateless cryptosystems,but Zhong et al.’s scheme is not resistant to Type Ⅱ adversary attacks,and Chen et al.’s scheme is not resistant to impersonation attacks and denial-of-service attacks.(2)A lightweight certificateless aggregated signature conditional privacy protection scheme is designed.To address the limited computing resources of the vehicular ad-hoc network,this paper designs a conditional privacy protection scheme suitable for certificateless aggregated signatures at the vehicle side.First,this scheme designs a new pseudonym generation method to guarantee the conditional privacy of vehicles.Second,this scheme uses elliptic curves instead of complex pairing operations,and uses the general hash function instead of mapping to points,which greatly saves system computational resources.Finally,for the scenario of sending messages in batch,the message aggregation signature operation is performed at the vehicle side to reduce channel conflicts.(3)Analyzing the security and performance overhead of conditional privacy protection schemesIn this paper,a security demonstration is given for the proposed scheme against the Type-Ⅰ and Type-Ⅱ advertisers in the random oracle model under adaptively chosen message attack.Meanwhile,performance comparisons are given for communication,computation and storage overheads in this paper,showing that the proposed scheme is more efficient than existing solutions,more suitable for resource-constrained vehicular ad-hoc network.