Research On Conditional Privacy Preservation And Security Authentication Scheme For Vehicular Ad Hoc Networks

The vehicle ad hoc network is a new type of intelligent transportation management system generated by the Internet of Things and urban transportation.In VANET,the vehicle is loaded with the on-board unit OBU,and uses the dedicated short-range communication protocol every 100-300ms to broadcast road traffic information to nearby vehicles,such as road congestion,driving status of surrounding vehicles,etc.,which can leave enough time for the owner to deal with emergencies and reduce road traffic accidents.At the same time,knowing the traffic information of the road in advance,the owner can choose an optimal driving route to improve traffic efficiency and reduce traffic burden.In addition,the VANET can also provide some entertainment facilities services for car owners and passengers,such as navigation,network access,and thus improve the driving experience.Due to the openness of the vehicle ad hoc network communication environment and the instability of the wireless network,the identity information of the vehicle user and the driving route of the owner are in an exposed environment all the time.If the vehicle user information cannot be effectively protected,it will lead to a series of security problems that lead to the collapse of the Internet of Vehicles system.At the same time,the VANET is vulnerable to many security attacks,such as simulate legitimate vehicles sending false messages to obtain benefits or convenience.Therefore,our thesis conducts theoretical research and practical exploration on the security communication authentication protocol of the vehicle ad hoc network,and proposes a privacy preserving authentication scheme suitable for inter-vehicle communication and vehicle and roadside unit communication.The work and contributions of our thesis mainly include the following contents.1)We first introduced the research background and significance of the vehicle ad hoc network,and conducted the corresponding research and analysis of the used the scheme of VANET,summed up their advantages and disadvantages and what else needs us to solve.It also introduces the system model of the VANET,the attack model and some security requirements.2)A conditional privacy protection thesis using dual pseudonym mechanism is proposed.The thesis uses the practical tamper proof device TPD and an elliptic curve algorithm without bilinear pairing operation.By periodically updating information stored in the TPD,such as member keys,authentication keys,and the inter identity of the vehicle;the attacker cannot obtain useful information through a side channel attack.At the same time,during the security proof,due to the difficulty of the elliptic curve discrete logarithm problem(ECDLP)in the random oracle model,the malicious attacker cannot forge the signature of the vehicle.In addition,in the performance analysis,we compared our thesis with other thesis,the computational overhead and communication overhead of our scheme is lower.3)A dual authentication security privacy-protection thesis is proposed.Firstly,when the vehicle broadcasts the security messages to other vehicles or the roadside units,it needs to execute the mutual authentication process with the aid of RSU between the vehicle and TA to ensure that the malicious attacker cannot enter the communication range of the VANET,and then simulates the legitimate vehicle to send the false messages.At the same time,because the encryption key and the internal pseudonym identity stored in the TPD are periodically updated,it can resist side channel attacks.In addition,because we do not use bilinear pairing operation,the thesis has lower communication overhead and computational overhead.In the security analysis,we prove that our thesis is unforgeable in the random oracle and can meet some security requirements.