Privacy Protection Scheme Of Vehicular Ad Hoc Networks Based On Ring Signature And Blockchain

Vehicular Ad Hoc Networks are the underlying technology for the implementation of an intelligent transportation system.In the Internet of Vehicles,the dedicated short-range communication is used to communicate with other vehicles or other communication facilities at high speed.Efficient information exchange and collection provide conditions for the intelligent transportation system to avoid traffic congestion and even traffic accidents through information processing choices,and ensure the convenience of driving and personal safety.However,vehicles have high mobility,and the safety of vehicles is related to the safety of drivers and the society,so the Internet of Vehicles has a high requirement for the authenticity and timeliness of information.At the same time,the network of vehicles is based on the dedicated short-range communication,and wireless communication itself is fragile and open,so vehicles in the network of vehicles must ensure the authentication of messages,and at the same time,to avoid identity privacy leakage caused by authentication.Most of the traditional privacy protection schemes of Internet of Vehicles rely on trusted third parties to solve the privacy protection problem.Therefore,thesis proposes a weakly centralized scheme to solve the privacy protection problem of users in Internet of Vehicles.The main work and contributions of thesis are as follows:1.An anonymous authentication protocol based on ring signature and blockchain is proposed.In this protocol,Conditional ring signature hides the real identity in the ring member and does not require the assistance of other members.To reveal the identity of the true signer,the signer can be proved to be the true signer by executing the recognition algorithm by himself or the true signer can be found by executing the denial algorithm by other ring members.Blockchain has the characteristics of decentralization,tamper-proof and transparency.The user pseudo name or temporary public key is signed with conditional ring signature,and the signature information is stored in the blockchain in the way of Merkle tree.In this way,a weakly centralized traceable authentication protocol is constructed to determine the authenticity of signed messages through the consensus protocol of the blockchain.Users can communicate with the pseudonymous or temporary public key after the ring signature is signed,so as to protect user identity privacy.When users commit evil acts,the true identity of the perpetrator is revealed through the disclosure algorithm.2.An identity privacy protection scheme for Internet of Vehicles based on weakly centralized authentication protocol is proposed.In this scheme,users use ring signature to hide their identity,which is stored on the blockchain,and the message is verified by the consensus node on the chain,so as to ensure the validity and authenticity of the signature information,and weaken the manipulation of the third party on the user’s privacy.The real identity of the user is hidden in the ring members of the ring signature on the block chain.The user only needs to conduct hash verification to prove that the identity used by the user exists on the block chain during communication,which ensures the identity privacy of the vehicle and the high efficiency of verification.Meanwhile,based on the characteristics of conditional ring signature,the scheme also has traceability.3.The implementation of the Internet of Vehicles identity privacy protection scheme is carried out,and the performance and security of the scheme are analyzed based on the experimental data.