Research On Privacy Protection For VANET Based On Ring Signcryption

The rapid development of the vehicular ad hoc network technology has improved road safety and efficiency.Due to the openness of the vehicular ad hoc network,it is easy to be attacked.Meanwhile,on-board network topology changes constantly,which needs higher requirements of real-time information.In addition,openness,wireless network's inherent property,makes the privacy information easy to leak.So the problem of privacy protection is paramount,and the key issue is that how to ensure the privacy information of vehicles not to be divulged during the process of message authentication.According to the analysis of the current VANET security issues,there are many studies on privacy protection,but they can't meet the need of VANET applications and the privacy protection.It becomes more and more urgent to solve the problem of privacy protection of vehicular ad hoc network efficiently.When a malicious vehicle or a dispute arises,the true identity of the message sender can be traced.Cryptography technologies,such as ring signature,ring signcryption have a great effect on privacy protection.This thesis intends to construct the privacy protection scheme in VANET communication in order to meet the security requirements of the vehicle network and achieve the purpose of protecting the privacy of the vehicle and tracking malicious vehicle.Through studying the cryptography algorithm,this thesis puts forward two new schemes for the privacy protection of VANET.The main efforts and contributions are as follows:1.Putting forward the VANET privacy protection scheme based on ring signcryption.Based on the anonymity of ring signature,the thesis analyzes the efficient signcryption scheme suitable for on-board network secure communication put forward by ZCD and so on.Based on the identity,this signcryption program with little computations and small transmission cost can not satisfy the feature of anonymity,and protect the privacy of the vehicle identity information.Based on the idea of scheme ZCD,this thesis constructs a ring signcryption scheme suitable for vehicular ad hoc network based on the identity which can meet the features of unforgeability,anonymity,confidentiality and accuracy.2.Putting forward the VANET privacy protection scheme of ring signcryption based on conditional anonymity.This thesis combines the idea of multi-receivers' anonymous ring signcryption of PCL with the idea of conditional anonymous ring signature of ZJQ,and then puts forward a conditional anonymous ring signature scheme(ALSP).It protects the identity's privacies of real signers while maintaining the confidentiality of the message.When there is a dispute or the presence of a malicious message vehicle,TRC can track,punish and revoke the vehicle unit.Under this circumstance,TRC applies the conditional anonymous ring signcryption scheme to VANET.3.Simulation of privacy protection scheme based on conditional anonymous ring signcryption by using the tool of NS-3.The throughput and packet loss rate are analyzed and presented in the form of graphs under different schemes and different numbers of vehicles.The ALSP scheme put forward in the thesis is better than other schemes and has better practical value.