The main objective of this project is secure dynamic auditing of shared data in the cloud. In existing we use Oruta, a privacy-preserving public auditing mechanism for shared data in the cloud. In this, we utilize ring signatures to construct holomorphic authenticators, so that a public verifier is able to audit shared data integrity without retrieving the entire data, yet it cannot distinguish who is the signer on each block. Our mechanism, Oruta, should be designed to achieve following

more »

... ies by Public Auditing, Correctness, Unforgeability and Identity Privacy. In our proposed system, an audit service is constructed based on the technique called fragment structure and supporting provable updates to outsourced data and timely anomaly detection. In addition, we propose a method based on periodic verification for improving the performance of audit services.