Research On Multi Cloud Dynamic Security Storage Technology

The arrival of the era of large data poses a higher challenge to the secure storage of data.Increasing data needs a large number of storage media to store,which results in high local storage costs,unreliable single storage mode,unsafe single cloud storage mode,and waste of storage resources caused by local data redundant storage.In view of these increasingly prominent problems,the traditional storage mode or single cloud storage mode has been unable to meet people's higher requirements for data security,data storage efficiency and reliability.In order to solve the security problem of data storage,this paper proposes a method of slicing data blocks,encrypting them separately,and storing them in multiple clouds.This method can avoid the data stored in a single cloud storage service data insecurity problem,because the data obtained by malicious means is only part of the encrypted data,compulsory cracking is also incomplete data,which greatly guarantees the security of the data.And this paper analyzes and compares a variety of data slicing and data encryption methods,according to the specific file type and data size using optimization strategy,so that its security and performance to achieve a balance.To further improve the reliability of data storage,this paper proposes a cloud dynamic storage scheduling strategy and an alternative configuration scheme for local storage.That is,multiple cloud data blocks can be dynamically scheduled by the multi-cloud service engine,so that the number of data blocks stored is not less than two at all,and the original data block and backup data block are not on the same cloud storage service.Users can also configure the metadata to store a copy locally and synchronize the data with an asynchronous update strategy.At the same time,this paper uses micro service architecture and decentralized strategy to ensure the availability of services.In order to solve the problem of data storage efficiency,a data de-duplication strategy is proposed in the multi-cloud backup system,and the idea of reference counting and reference reachability is used in the multi-cloud storage system.That is,the data storage space can be as small as possible by data de-duplication within the user and de-duplication between the same data users.This paper also compares other data de-duplication methods,which can adopt appropriate de-duplication strategy according to the data storage type to further improve the data storage efficiency.Aiming at the above key problems and other problems in the multi-cloud dynamic secure storage system,a preliminary multi-cloud dynamic secure storage system is designed to verify the feasibility of this scheme.Writing structure is also based on this background,from the relevant key theory to system architecture design,and then to the prototype implementation of multi-cloud dynamic storage system.Finally,the system is tested and analyzed.The experimental results show that the scheme has strong feasibility and can achieve the expected design goals.