Method Of Data Integrity Werification Based On Storage

Cloud storage is a very popular new storage with the advantages of huge and cheap storage space.With the rapid development,security,especially data integrity verification,is becoming more and more important for cloud storage.Generally,users save data in the cloud servers,but don't back up them in their own terminals.If cloud servers are attacked or break down,users will permanently lose data.On the other hand,could storage provider sometimes conceals data loss to avoid responsibility.In order to resolve these security problems,this paper researched data integrity veirication of cloud storage.First,we studied the drawbacks of existing intergrity verification schemes about performance and security.Then,we proposed two advanced schemes of single cloud and hybrid cloud.Finally,we analyzed experiments results.The main contents of this paper include the following three aspects:(1)We analyze various security problems existed in current cloud storage system with a focus on data integrity verification.Thereafter,in-depth analysis is conducted on current method of data integrity verification in both single cloud and hybrid cloud storage,revealing its drawbacks in both performance(communication overhead,computational overhead)and security(support of third-party authentication).Finally the paper concludes the recommended focus and direction of future research.(2)In single cloud storage,we summarize the general deficiency of existed data integrity verification method and propose a simpler and more efficient verification scheme with less communication overhead.The proposed method utilizes the advantage of Diffie-Hellman algorithm on the basis of Merkel Tree model and achieves unlimited selective verification of cloud data with minimized 0(1)local storage and O(log n)communication overhead.(3)In hybrid cloud storage,we adopt BLS Signature algorithm based on bilinear mapping and proposes a scheme capable of verifying data integrity in one time when data is dispersed in multiple clouds.By introducing relay and utilizing homomorphic aggregation,this scheme achieves highly efficient data integrity verification in hybrid cloud stroage.