Design And Implementation Of Secure Authentication And Typical Attack Defense Mechanism In Connected Platoons

With the development of intelligent transportation systems,Vehicle to Everything(V2X)technology can help vehicles share efficient information.As a typical application scenario of V2X technology,the connected platoon is of great significance in improving the efficiency of transportation and reducing energy consumption.However,due to the high-speed movement and dynamic changes of member vehicles in the connected platoon,its communication security is more vulnerable to threats.Malicious cyber-attacks will interfere with the normal communication between member vehicles,resulting in greatly reduced safety of the connected platoon,and even traffic accidents.Therefore,a reliable and secure communication mechanism needs to be established for the connected platoon.In response to the above problems,this thesis first proposes and implements a distributed authentication mechanism for the connected platoon.This mechanism uses a dynamic threshold signature algorithm based on elliptic curve cryptography and threshold secret sharing theory to solve the single-point failure problem of traditional centralized authentication.This thesis also implements the dynamic update of the authentication key and the dynamic selection of the threshold to support the join and exit of member vehicles.Security analysis proves that the mechanism can prevent the leakage of the authentication key,has forward and backward security,and can effectively defend against counterfeit attacks,replay attacks,man-in-the-middle attacks,and collusion attacks.In order to resist internal attacks during the communication of the connected platoon,this thesis designs and implements a malicious member detection mechanism based on a reputation evaluation model,and evaluates the reputation of member vehicles based on different types of message data.This thesis also proposes a blockchain-based communication architecture for the connected platoon,and uses a consensus mechanism based on Practical Byzantine Fault Tolerance(PBFT)to record the message data of all member vehicles in the connected platoon into the blockchain to ensure that the message data used for evaluation is completely credible and shared by all member vehicles.At the same time,for the On-off attack that the reputation threshold algorithm cannot detect,this thesis designs a detection algorithm based on the malicious message penalty coefficient and sliding window.In order to simulate the above security mechanism and evaluate its performance,this thesis builds a system-level simulation platform based on the Veins(Vehicles in Network Simulation)framework.The platform combines LTE-V2X(LTE Vehicle-to-Everything)communication simulation module,traffic simulation module and blockchain simulation module,and realizes the interaction between multiple modules by message queuing.On this simulation platform,this thesis simulates the highway scenario of the connected platoon,and analyzes the driving performance of the connected platoon under external and internal attacks.At the same time,the simulation implementation and performance evaluation of the above security mechanism are carried out.Experimental results show that the mechanism in this thesis has lower delay and higher efficiency,and can meet the secure communication needs of the connected platoon.