Research On Privacy Protection Data Transaction Scheme And Its Application Based On Blockchain

With the advent of big data era,the openness and sharing of transaction exchange is the inevitable development trend to promote the reasonable flow of data value and build big data ecosystem.However,the problem of privacy leakage,sharing efficiency,fairness and so on in open data sharing have become the bottleneck of its promotion and application.Blockchain technology is one of the cutting-edge technologies in the field of security.It is a distributed database that realizes transaction security by means of decentralization and cryptography.It has the characteristics of decentralization,anti-tamper,anonymity,public verifiability,traceability.These characteristics are helpful to solve the key constraints in the current data transaction,which can guarantee the fairness on the basis of privacy protection,improve the sharing efficiency,and provide a solution path for trading off privacy protection and data utility.On the basis of privacy protection,aiming at the key scientific challenges such as efficiency and fairness in data transactions,this dissertation studies the fairness,sharing efficiency and privacy protection of transactions by applying blockchain technology in data sharing scenarios and aiming at the security problems existing in privacy protection in data transactions.Based on information theory and game theory,using blockchain technology as a tool,the traceability and authentication protocol are studied.Focusing on the Internet of vehicles charging transaction scenario,a traceable and verifiable key information exchange scheme was designed and implemented by using BIT Commitment and BTC(Bitcoin Script)script framework to propose and implement a fair data sharing scheme.In order to tackle the problems of poor fairness and low efficiency,a new big data sharing transaction protocol and its implementation scheme were designed by using IPFS(Interplanetary File System)and smart contract to optimize network transmission,and a general data transaction model was formed.Finally,this dissertation puts forward the de-management security model for block chain trading system.The main research contents and innovations are as follows:(1)A traceable and authenticated key information exchange scheme based on blockchain is proposed.Using DH(Diffie-Hellman)key exchange protocol and decentralized value network,this dissertation proposes a traceable and Authenticable key agreement scheme,key information is embedded in the monetary value exchange,the key data exchange process into the process of currency trading.Using value channel,the static script and dynamic script to implement the data exchange and key identify respectively.The sharing scheme can inspire improving value of big data flow,and tackle the problem of trade credit and security,and safeguard the privacy protection in the process of sharing.Finally,the proposed scheme is applied to the field of vehicle energy trading,and the experimental results show that the proposed scheme can tackle the problems of data security,data tampering,history tracking,effective monitoring and transaction trust more effectively.Key negotiation is the core supporting technology of data encryption in blockchain systems,which is of great significance to the follow-up schemes in this study and the practical applications of other blockchain technologies.(2)A fair big data transaction sharing protocol based on blockchain is proposed.According to the current trading system model and attack model,in the case of no trusted third party data transmission,a fair big data exchange sharing protocol based on blockchain is proposed by using Bit commitment and Bitcoin script framework.and the corresponding algorithm is designed.The protocol can realize decentralized data sharing in an autonomous way,ensure fair trading and automatic exchange,and avoid the problems of sharing efficiency and extra commission.The protocol ensures that the data owner will not leak the transaction data if he or she does not receive sufficient payment.Data consumers,meanwhile,will not lose their token while they do not have access to complete transaction data.In order to avoid the malicious behavior of the buyer,an enhanced scheme is designed by adding a safeguard mechanism to prevent the attacker from deploying multiple fake buyers to launch transaction requests and consume computing resources.(3)The privacy protection and fair big data transaction scheme based on smart contract is proposed.In order to ensure fair data transaction,prevent trade fraud,improve transmission efficiency and protect user privacy,the transaction scheme reduces the transmission burden of blockchain by using transmission link.Meanwhile,using the powerful functionality of IPFs system,combined with inadvertent transmission protocol,symmetric encryption algorithm,digital signature,etc.,to improve the security and reliability of data transaction.In addition,using smart contract technology,the scheme can be released on Ethernet.The data owners in the scheme can transmit the data on IPFs network to the data consumers through the link,which effectively reduces the traffic pressure caused by data transmission on the blockchain,and forms a general data transaction model.Through the analysis of the implementation of the protocol and the current mainstream eavesdropping and retransmitting attacks,it is concluded that the scheme is reliable and secure.(4)A secure energy transaction scheme based on Consortium blockchain is designed.A new energy transaction model is proposed to solve the problem of data transaction privacy leakage in the energy Internet.The model takes the traditional energy transaction model as a reference and creatively proposes a one-to-many secure account matching mechanism based on the alliance chain.In the transaction,a new wallet account is generated to resist the attackers' acquisition of users' private data.On this basis,combined with the characteristics of the Consortium Blockchain and the number of new accounts' changes in the transaction model,the simulation experiments were carried out on privacy protection,transaction efficiency and security.The results show that the scheme has obvious advantages in privacy protection,transaction efficiency,security efficiency and other aspects,and can be well applied to energy Internet trading scenarios.