Dynamic Outsourced Proofs of Retrievability Enabling Auditing Migration for Remote Storage Security

Abstract

Remote data auditing service is important for mobile clients to guarantee the intactness of their outsourced data stored at cloud side. To relieve mobile client from the nonnegligible burden incurred by performing the frequent data auditing, more and more literatures propose that the execution of such data auditing should be migrated from mobile client to third-party auditor (TPA). However, existing public auditing schemes always assume that TPA is reliable, which is the potential risk for outsourced data security. Although Outsourced Proofs of Retrievability (OPOR) have been proposed to further protect against the malicious TPA and collusion among any two entities, the original OPOR scheme applies only to the static data, which is the limitation that should be solved for enabling data dynamics. In this paper, we design a novel authenticated data structure called bv23Tree, which enables client to batch-verify the indices and values of any number of appointed leaves all at once for efficiency. By utilizing bv23Tree and a hierarchical storage structure, we present the first solution for Dynamic OPOR (DOPOR), which extends the OPOR model to support dynamic updates of the outsourced data. Extensive security and performance analyses show the reliability and effectiveness of our proposed scheme.

Cloud Computing: An Exploration on Data Integrity and Its Techniques

“…The cloud server will provide incorrect result to the user result because of less transparency in the computational details. [6].…”

“…If any unauthorized user access the cloud and data is altered or loss means, it is difficult for the users to find and replace the data if backup of data is available. [6].…”

“…It defends against malicious TPA. So as to ensure the logarithmic complexity DOPOR uses a special authenticated data structure called bc23Tree.To avoid the deletion attack , a hierarchical storage structure with uniform size level encoded data and encoded update operation is deployed [6].…”