Research On Authentication And Privacy Preserving Schemes For Vehicular Ad-hoc Networks

The vehicular ad-hoc network(VANET)is a comprehensive optimization platform for the communication between vehicles and the foundation of the future intelligent transportation system.During the running of the vehicles,VANET improves the traffic efficiency,improves the comfort of the vehicle occupants,and greatly improves road traffic safety.However,with the rapid development of VANET technology,it brings convenience to people,also brings a lot of information security problems.Because the openness and vulnerability of the wireless network,it is vulnerable to be attacked and destructed,and suffers various security risks such as information forgery,information tracking,and tampering attacks.The wireless communication in the vehicle network brings opportunities to the attackers and the privacy of the users is vulnerable to a serious threat.Therefore,the deployment and construction of vehicle ad-hoc networks must satisfy the security requirements such as the authenticity,nonrepudiation,and integrity of the information.The topology of VANET changes rapidly,the quality of wireless channels is unstable,and the real-time communication requirements are also in emergency.In the situation that the vehicle communication unit has limited computing power and storage capacity,constructing a security and real-time vehicle communication network is also a research hot topics in recent years.This thesis is based on the subject of the privacy preserving problem of vehicle ad-hoc networks and systematically analyzes the challenges it faces.This thesis systematically analyzes the challenges faced by the privacy preserving of vehicular ad-hoc networks and focus on constructing VANET privacy preserving solutions that are both secure and real-time.This thesis proposed two VANET privacy preserving schemes,the main contribution are as follows:1.This thesis constructs a signcryption scheme in the authentication process,base on the scheme,proposes a privacy preserving scheme for real-time navigation system based on vehicle ad-hoc network.It satisfies anonymity,confidentiality,unforgeability and real-time.At the same time,the correctness of the scheme is analyzed,and it is illuminate that this scheme is suitable for the real-time navigation system under the vehicle ad-hoc network.The scheme optimizes the navigation path algorithm.The optimization algorithm is more suitable for the hardware of the communication equipment based on the vehicle ad-hoc network.By selecting and combining the signcryption schemes,the authentication schemes and the optimal path algorithm,the system can realize the vehicle real-time navigation.2.At present,the communication environment of vehicle ad-hoc networks is limited in resources,and the on board unit has a weaker computing capacity,a smaller communication channel capacity,and a lower communication efficiency.Based on such infrastructure,this thesis proposes a short signcryption scheme based on an vehicle ad-hoc network.In other signcryption schemes,short signcryption has the advantages of short ciphertext,small computation,and high communication efficiency.Therefore,short signcryption is more suitable for vehicle ad-hoc network communication with limited resources and fast topology change.Short signcryption can achieve higher security with lower system overhead.3.This thesis simulates the privacy preserving scheme based on vehicle ad-hoc network navigation system by NS-3 tools.The throughput and packet loss rate are analyzed under different the number of vehicles and displayed in a visual form.The results show that the navigation system has a good practical value in real life.