Abstract: With the development of autonomous driving and intelligent transportation systems,vehicle networking technology is playing an increasingly important role.Due to the open access environment of the Internet of Vehicles,how to ensure the reliability of messages and the credibility of vehicles has become a major security challenge.Building upon existing blockchain-based trust management solutions,there is a need to redesign a trust management framework for vehicular networks to address scalability issues and the inefficiency of consensus algorithms in current solutions.The framework is primarily composed of three modules:message trust evaluation,vehicle trust update,and the creation and consensus of trust blocks.In the message trust evaluation module,to identify false messages from malicious nodes,the credibility of messages is comprehensively assessed based on the direct trust of vehicle entities and the indirect trust from neighboring vehicles.In the vehicle trust update module,to effectively curb malicious behavior,vehicle trust is adjusted based on message evaluation results and the historical behavior of vehicles.In the block creation and consensus module,an optimized consensus algorithm based on proof of importance is proposed,considering event significance and blockchain scalability.Finally,the usability of the framework is verified by simulation experiments,and the comparative experimental results show that the proposed algorithm achieves good results in scalability and robustness.

Key words: Internet of Vehicles, Trust management, Blockchain, Consensus algorithm