| With the advent of the era of big data,the application of big data technology is becoming more and more mature.E-commerce has become the focus of people's attention due to its abundance of online and offline resources,thus generating many centralized online trade platforms.Considering the problems of user privacy risk and various hidden operations in the centralized platform,the decentralized blockchain technology is used to assist the e-commerce field to develop towards a more humanized and secure goal.Blockchain has been adapted to transaction processing in various scenarios since its development.As a whole,it can be divided into two categories:nonpermissive blockchain and permissioned blockchain.The nonpermissive blockchain is started by bitcoin transactions,and its features of complete decentralization,data anti-tampering and encryption are very suitable for the development of electronic currency.However,with the increasing cost of block mining and the limitation of data storage,the corresponding application field cannot be extended.Therefore,the research on permissioned blockchain will made up for this deficiency.This paper studies the consortium blockchain capacity expansion technology and privacy data protection with the technical background of e-commerce data processing.The main research contents include the following two aspects.Firstly,aiming at the security and efficiency problems in e-commerce commodity traceability system,based on the decentralized security features of blockchain,an efficient storage solution based on consortium blockchain is proposed.First of all,through the Inter-Planetary File System(IPFS)to hash the commodity data,so as to reduce the amount of single transaction data in the block,using the principle of data irreversibility of IPFS to achieve the initial data protection;Secondly,the consortium blockchain model for data verification was established,and the Practical Byzantine Fault Tolerant(PBFT)algorithm was used as consensus algorithm for blockchain data verification to reduce the consensus time of the whole network.Finally,according to the number of participating nodes,block size and network band width in the simulation experiment,the time curve of the verification transaction was fitted;furthermore,the blockchain transaction efficiency under different bandwidths was calculated,and by using the actual situation of the commodity traceability system with the participation of tens of thousands of sensors,the blockchain double-chain structure was compared to give the analysis results.The experimental results show that under the condition of less than1000 verification nodes,the maximum consensus length of blockchain is 32 min,and the consortium blockchain system can support 350000-400000 sensor data which can be applied to large-scale and multi-data commodity traceability.Secondly,aiming at the privacy and security issues caused by the untrustworthiness and opacity market transactions under the circumstance of centralized guarantee and audit provided by the third-party platform in the traditional e-commerce scenario.A new e-commerce transaction system is proposed by using consortium blockchain technology.The system can be widely used in e-commerce transactions to get rid of the general scenario of trusted intermediaries.In addition,in order to solve the problem of user privacy,the Public-key Encryption of Keyword Search based on Hyperledger(HPEKS)was used to build the private data security model.The security analysis and numerical results based on real datasets show that the proposed HPEKS system is feasible. |
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