Research On Privacy Protection Technology Based On Alliance Chain

With the popularity of bitcoin,the blockchain technology behind bitcoin has gradually come into people's view.Its idea of decentralization has gained a large number of supporters and attracted a large number of scholars and technicians to study blockchain.However,everything has two sides.The key feature of blockchain technology,which allows everyone to participate in and maintain the public account book,also has hidden disadvantages,that is,the problem of disclosing user privacy.In the blockchain network,transaction data is exposed to the others openly and transparently.In order to maintain the privacy and confidentiality of transactions,and keep the invariance of data at the same time,based on the analysis of the existing blockchain privacy protection technology,this thesis proposed a scheme to protect the transaction privacy of consortium blockchain based on zero knowledge proof and homomorphic encryption,and applies it on the hypeledger fabric platform.The main work of this paper is as follows:(1)This paper proposes a privacy protection scheme based on consortium chain.On the research of various privacy protection technologies in blockchain,the privacy protection transaction scheme is designed in the scenario of consortium blockchain based on zero knowledge proof and homomorphic encryption.With the encryption technology to hide the transaction details on the public ledger,and let it pass the verification without disclosing the transaction information,so as to update the trader's assets to complete the transaction.(2)On the basis of the design of transaction privacy protection scheme,the privacy transaction verification rules are constructed and the privacy trading system of the consortium blockchain chain is tested.The test includes the effectiveness test of the effection of protecting the privacy of transactions,and the function of the transfer of legal and illegal transaction information.The experimental results show that the scheme designed and implemented in this paper can protect the user transaction privacy in the hypledger fabric.Compared with other classic blockchain privacy protection schemes,the efficiency of the scheme is measured.The experimental results show that the scheme provides strong privacy protection capability,effectively solves the privacy problems existing in using blockchain for transaction,and provides reasonable performance for the application developed based on its framework,It has a good application prospect in the privacy protection of blockchain.