Research Of Privacy Preservation Based On Pseudonym In Vehicular Networks

The Internet of Vehicles(IoV)is a vehicular network structure built by vehicles' communication relationship,and it can connect different vehicles through the Internet.Moreover,with the coming of information society,the IoV has become the most typical application of the Internet of things in the field of intelligent transportation.However,due to the characteristics as openness of wireless channel and the predictability of the moving track,the problem of privacy-preserving in the process of communication is urgent to be solved.As an important task of information security,privacy protection has become a research hotspot in recent years and the traditional privacy protection mechanism is no longer adapt to the environment of vehicular networks.It is significant to study the privacy protection scheme for the promotion and deployment of the IoV.Therefore,according to the comprehensive summary and analysis of the related research about vehicular networks at home and abroad in recent years,the thesis mainly studied two aspects: the pseudonym changing and the privacy-preservation based on pseudonym.The highlights of this thesis are as followed:1.This thesis proposes a pseudonym changing scheme for vehicle privacy-preserving in vehicular networks.This scheme introduces the driving coefficient and the level of request to calculate the interval of pseudonym changing,which realizes privacy protection from time level.At the same time,the thesis introduces the idea of interest points,and discovers the pseudonym changing region for vehicle by clustering,realizing the owner's privacy protection from space level.Based on this,the thesis will change vehicles' pseudonym according to the request defined the pseudonym changing internal criterion.On this basis,this strategy can prevent the continued tracking of the attacker and provide the drivers with continuous and efficient privacy protection.2.This thesis puts forward a secure authentication and privacy protection scheme based on pseudonym according to the requirement of privacy and efficiency.Firstly,the thesis takes the vehicle nodes as the main object of authentication,and this schema uses pseudonym certificate as users' identity to achieve the privacy protection of drivers.Secondly,the thesis takes the multi-hop message forwarding in vehicle to vehicle communication as the research subjects,and presents a lightweight message authentication method to verify the message's signature in a short time.In addition,this method can verify the integrity and non-repudiation of messages and protect the security of communication between nodes.Meanwhile,in order to prevent illegal nodes using expired certificate forged vehicle identity attack,the thesis changes vehicles' pseudonym certificates regularly and revokes the certificate sets of vehicles which have applied or have attacked other vehicles based on the certificate revocation list.Finally,the thesis carries out theoretical analysis and simulation experiments to verify the proposed scheme.