| Intelligent transportation system realizes traffic intelligence with intelligent technology,which greatly improves traffic operation efficiency and safety and social benefits.As a key technology in the intelligent transportation system,the Internet of vehicles can share data intelligently and efficiently.The data sharing in the Internet of vehicles makes the traffic participants master the traffic data in real time and comprehensively.With the continuous expansion of the deployment scale of the Internet of vehicles,in the open network environment of the Internet of vehicles,its data sharing is facing a series of problems,such as data security,user privacy protection,system operation efficiency and cost challenges.In view of this,this paper designs an Internet of vehicles data sharing system based on alliance blockchain,uses alliance blockchain technology to ensure the safety of Internet of vehicles data sharing,integrates compressed sensing technology to ensure the efficiency of Internet of vehicles data collection and transmission,improves pbft consensus algorithm to increase data storage efficiency,and uses IPFS system to expand data storage space outside the chain,Use smart contract to write data sharing mechanism.The specific research contents are as follows:(1)Based on the alliance blockchain technology,build an Internet of vehicles data sharing system based on the alliance blockchain,and take the vehicle node as the data node for data collection,transmission and processing.Take the RSU node as the consensus node,run the consensus algorithm to store the data in the blockchain system.Combined with cryptography technology to ensure the security of data circulation.(2)Based on compressed sensing technology,vehicle nodes compress and collect original data to save data collection and subsequent transmission time.After being processed by encryption algorithm and consensus algorithm,the data is stored in the blockchain system,and then synchronized to IPFS system for original data reconstruction.(3)By optimizing the pbft consensus mechanism,the consensus delay is reduced and the block rate is improved without affecting the correctness of consensus verification.(4)The IPFs system is applied to store a large amount of original data of the Internet of vehicles outside the chain,and convert the original data into hash data for uplink storage,further saving the storage space of the blockchain.Users can interact with the blockchain through IPFs to compare the integrity of data by index.(5)Write smart contract code and set up data sharing mechanism to ensure safe and efficient data sharing.(6)Hyperledger fabric is used to simulate the system operation and functions.The simulation contents include node data acquisition and transmission,node data consensus and verification,node data storage and sharing.(7)Simulate the key performance parameters of the system,export the simulation results,and compare them with other relevant research results to verify the advantages of the system. |
