| The Internet of Vehicles（Io V）is an intelligent internet which can realize dynamic interaction of vehicles to vehicles,road,infrastructure,person and other media according to communication protocols.As an important indicator to measure the performance of the Io V,information transmission efficiency is one of the main research directions in the field of Io V.At present,the implementation of efficient information transmission in the Internet of vehicles is restricted by malicious attackers and privacy protection schemes.In this way,improving the information transmission efficiency and privacy protection capability of the Io V has become an urgent problem to be solved.Blockchain technology stands out with the characteristics of decentralization and data immutability,and is widely used in the Io V.However,due to the complexity of calculation and storage of traditional blockchain technology,there is still room for improvement in the information transmission efficiency of its blocks.In this paper,a Phantom DAG blockchain using transaction confirmation protocol is designed by improving the sorting rules and consensus algorithm.The main research work is as follows:（1）Research on efficiency dissemination of information in view of the Phantom DAG blockchain with improved sorting rulesAiming at the characteristics that graph structure blockchain requires different block collations in different application scenarios,this paper presents a Phantom DAG blockchain found on improved collation rules.According to the location,driving route and reputation of the vehicles in the Io V and other factors,improved Phantom DAG blockchain selects the most similar parent block for the newly added blocks,thereby effectively improving the efficiency of information verification between blocks,so that the Io V can efficiently disseminate information.In addition,this paper also designs a kind of effective long supervision and punishment mechanism based on reputation and information,which will periodically check car networking violations that exist in the phenomenon of conflict,reduce the risk of car networking by malicious attacks,maintenance vehicle networking security.The experimental results show that,compared with the Phantom graph structure blockchain before the improvement,the improved Phantom graph structure blockchain has higher information dissemination efficiency and security.（2）Research on information transmission efficiency of Phantom DAG blockchain based on improved Proof of Vote consensus algorithmIn quest of the application of the Phantom DAG blockchain,the Io V can reach consensus as soon as possible when there is an information conflict,so as to quickly resolve the information conflict and improve the dissemination efficiency of information between vehicle nodes.This paper brings forth an improved Proof of Vote consensus algorithm and applies the consensus algorithm to the Phantom DAG blockchain.The consensus algorithm assigns different identities and tasks to the various nodes involved in the Io V according to the differences in hardware and functions,so that the Io V that deploys the consensus algorithm can integrate the opinions of nodes as soon as possible to reach consensus and improve the efficiency of information dissemination.Experimental results suggest that the improved Proof of Vote consensus algorithm has higher consensus efficiency,which can further improve the information dissemination efficiency of Phantom DAG blockchain.In summary,by improving the sorting rules and consensus algorithm of Phantom DAG blockchain,this paper enables the Io V to efficiently complete information verification and consensus,and improves the information dissemination efficiency of the Io V.At the same time,through the supervision and punishment mechanism based on credibility and the effective duration of information,this paper periodically checks the irregularities in the Io V and enhances its security.Finally,the full text is summarized and the future research directions are prospected. |
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