Research On Secure Data Transmission Method Of Edge Devices Based On Blockchain

With the rapid development and wide application of the Internet of Things technology,the number of Io T devices is growing rapidly.The concept of the Internet has been expanded through the interconnection of all things to realize the interconnection of all things.Edge computing has been widely used in the field of Internet of Things because of its advantages in effectively reducing the latency of computing systems,reducing data transmission,and alleviating the pressure on cloud computing centers.However,due to the openness of the edge environment and the use of wireless communication between nodes,the data will be subject to tampering attacks and man-in-the-middle attacks during the transmission process.The security of the data transmission process has become a bottleneck restricting the development of edge computing.Most of the existing methods of using blockchain technology to achieve secure transmission of edge data ignore the problems of low computing power of edge devices,difficulty in mining and excessive energy consumption.Based on this,this thesis focuses on how to improve the direction of secure data transmission between edge nodes.The main works are as follwed:First of all,this thesis proposes a blockchain network framework based on proof of work,and designs a consensus mechanism for proof of work based on trust.The consensus mechanism sorts the trust value of each network node through the Trust Rank algorithm,so that the high trust value node has low mining difficulty and solves the problem of proof of work.In the proof-of-trust consensus mechanism,the accuracy of node trust value ranking is improved by fusing the two influence factors of network topology ranking and user’s own characteristics.This thesis has done a series of simulation experiments to compare the efficiency,energy consumption and anti-attack of the proposed proof-of-trust consensus mechanism with mainstream consensus mechanisms,verifying that the consensus mechanism has low energy consumption and is applicable to edge devices.Secondly,this thesis proposes a data encryption transmission scheme based on the proof of trust.By designing the four stages of transmission between the sender and the receiver,including data transmission request,release confirmation message,public confirmation message,and complaint phase,to achieve direct interaction with smart contracts.To realize the security of data transmission,this thesis upload the data to the blockchain network to realize the traceability of the data.By comparing the proposed transmission scheme with the traditional SSL/TLS protocol in terms of time cost and storage cost,simulation experiments are carried out to verify the feasibility of the data traceable transmission scheme based on proof-of-trust consensus mechanism in terms of security and efficiency.Finally,based on the above methods and theories,this thesis uses the mainstream Hyperledger Explorer blockchain platform to build a blockchain-based edge device data secure transmission prototype system,and develops a smart contract that provides corresponding functions to verify the anti-attack of the data in the transmission process and realize the traceability of the data.