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The vehicular ad hoc network (VANET) is an intelligent transportation system application that aims to ensure the security of road traffic information over V2V communication and V2I communication. In this paper, we propose a blockchain-based privacy-preserving authentication scheme in VANETs. We explore the strategy of a local blockchain for VANETs. We make use of a private blockchain for authentication and a public blockchain for managing event messages. The trusted authority (TA) is responsible for making the transactions in the private blockchain within the boundary of the countries, the transactions are the identity information required for authentication of vehicles when they join the network for the first time, the other vehicles have the right to read and check from the private blockchain the authenticity of a new vehicle. The public blockchain is used for storing the event messages within the boundary of pre-defined regions to ensure the security of message dissemination, we called this kind of blockchain road-side unit blockchain (RSU-BC) because it takes the role of RSU in a VANET. In this way, we eliminate the necessity of RSU's deployment in VANETs and reduce the dependency on the TA. By way of security analysis and security-proofing, we prove that our scheme satisfies multiple security and privacy requirements and can resist many attacks, while the performance analysis shows the efficiency of the scheme in terms of computation overheads and communication overheads.
Guehguih et al. (Sat,) studied this question.