Research And Implementation Of Asymmetric Fragmented Multi-cloud Backup And Recovery System

In the age of Internet technology,data storage has become increasingly important.At present,cloud storage,as a widely used new storage method,is increasingly accepted by the public.The resulting cloud storage products are becoming more abundant.However,as the needs of users increase,the volume of data storage increases,which brings the plight of the confidentiality of massive data.This thesis studies the development trend,main technical means and operational services of cloud storage,and analyzes the current research status and potential security risks involved in cloud storage.This thesis proposes a data storage solution based on asymmetric fragmentation and multi-cloud.The main work of this thesis is divided into the following aspects:1.File fragmentation technology.Analyze the storage format of the file,and use appropriate file shredding technology to perform implicit data encryption on the file instead of using a direct encryption mechanism.Protect file content security and improve the efficiency of data security by encrypting and fragmenting of file descriptors and file bodies.2.Cloud storage network.Through the research on the file storage and access methods of IPFS,the object storage network module suitable for user needs is designed.Utilize the Interplanetary file system's content addressing and support for distributed features to transmit data in a faster and safer way.IPFS is a point-to-point hypermedia transmission protocol.This article uses the hash deduplication of IPFS to build a cloud storage service with data redundancy and deduplication,reducing storage costs and improving storage efficiency.3.Asymmetric fragmented multi-cloud storage model.The file is broken and cut,and the arrangement information(ie metadata)of the fragmented data is separated from the data fragments.The metadata is stored locally,and each data fragment is stored in the cloud node of the Interplanetary File System.Since the identification information of the data fragments and the arrangement index between each data fragment are only under the control of the user,it becomes very easy for the user to restore the file.Illegal users who want to steal file data will find it difficult to obtain all the fragments of a single file,and because they do not know the specific format and content of each fragment,it is difficult to parse and crack the entire content.It also uses the features of IPFS to remove duplication to improve the storage efficiency of cloud storage nodes.4.Choice of storage strategy.Analyze the different delay,bandwidth,storage capacity,storage cost and other factors of cloud storage nodes deployed in the network,and choose appropriate data fragment distribution strategy.The choice of strategy should consider the deployment cost,storage cost and other factors to select the solution with the best user experience.5.Design and implement the storage system,test the core functions,and analyze and compare the test results.