Research And Application Of Information Cloud Storage System Based On Blockchain

With the gradual development of blockchain technology,its application is becoming more and more extensive,so the the blockchain platform which carried on data is also increasing.Blockchain is an increasing amount of data of timing of distributed database,in addition,due to its characteristics of decentralization,each node of blockchain need to load all the data on the chain,blockchain nodes host need to have a larger storage space and high performance,and the host node has not enough storage will have obstacles on data synchronization.At present,the common means in the market is to store the data on the host in the cloud.The big challenge of the cloud on the data is how to ensure the security of the data.Therefore,the security storage of the data is the scalability problem that needs to be solved.Based on the current development situation,this paper designed a cloud storage system based on blockchain information,in addition to achieve the cloud storage of blockchain,data security is also available,due to the application is mainly focused on the blockchain platform,blockchain platform design for cloud storage plays a key role.Due to the consensus algorithm is the core of blockchain,this paper designs and realizes data store suitability DPCFT consensus algorithm,the main reference of the authorization of DPOS decentralization ideas,CFT which is fault-tolerant algorithm and common Paxos distributed consistency algorithm thought,with the major characteristics of the two-phase commit,and design calculation model,and The comparison with the public blockchain on market including Bitcoin and Ethereum proves its the availability of its data on cloud storage.Based on the blockchain platform,this paper designs the framework model of cloud storage.First of all,on the common cloud storage model on market research,including Symmetric and asymmetric encryption cloud storage models,this paper designed this cloud storage model is based on homomorphic encryption according to the applicability of the underlying blockchain system,established with BGV fully homomorphic encryption algorithm for HElib library for this section of the underlying implementation is used for data privacy protection algorithm.In addition,details of data storage such as key distribution,storage on data cloud,data retrieval and data update are also designed in detail in this paper.After designing the cloud storage model,this paper evaluated the privacy performance,efficiency performance and economic performance of the model,and concluded that the homomorphic algorithm BGV of privacy protection of the model was compared with the FHE scheme of Gentry in terms of operation time and ciphertext expansion and other aspects of efficiency,and concluded that the BGV scheme was more applicable to big data.