Research On Key Management For Secure Communication In Internet Of Vehicles

Internet of Vehicles is a key technology in the field of intelligent transportation.It can realize the communication between vehicles,protect the life safety of drivers and traffic guidance.It is of great significance to improve traffic efficiency and driving safety.With the increasing number of vehicles and the more complex traffic environment,the information transmission in the Internet of vehicles has become more frequent and important,and the security of communication in the network has also ushered in more challenges.The high openness and high dynamic characteristics of the Internet of vehicles make the communication between nodes in the network vulnerable to various attacks,and the use of key encryption information to ensure communication security is the main means to solve the problem.Therefore,it is necessary to manage the key used in cluster communication to ensure the security of communication in vehicle network.This thesis aims to study the secure and effective cluster key management based on the communication scenario of Internet of vehicles.The main work is as follows:A certificateless batch key agreement scheme is designed.Based on the assumption of ECDLP difficulty,a secure key agreement process is designed,which can authenticate the legal identity of vehicle nodes without certificates and CRL,and can process in batch when multiple vehicles enter the area at the same time.It improves the problems of high computational complexity and high communication overhead in the identity authentication process in the traditional key management system,improves the communication efficiency on the premise of ensuring security,and reduces the computational burden of vehicle unit and roadside unit.A lightweight stateless key update scheme is designed.According to the PBFT algorithm and the actual requirements of the Internet of vehicles,a strategy of cluster key dynamic time slot is designed to balance the communication cycle and performance overhead.The lightweight key update process is designed in detail according to CRT.The vehicle nodes in the cluster only need to carry out lightweight operation to complete the key update without storing the key state.While ensuring the forward and backward security,it reduces the consumption of communication and calculation,improves the availability of key management scheme in the Internet of vehicles environment with low delay tolerance,and makes more rational use of node resources in the network.Finally,this thesis proves and analyzes the security of the designed key management scheme,then analyzes and compares the performance of the scheme in terms of computational overhead and communication overhead through simulation,and finally simulates the dynamic slot key update simulation to evaluate the practical application ability of the scheme.The simulation results show that the scheme has good performance while ensuring security,and meets the needs of vehicle networking scenarios.