Public Auditing Scheme providing Privacy for Cloud Data with Group Users

Cloud Computing

In this paper, we propose privacy-preserving mechanism which supports public auditing on shared data stored in the cloud. In this, we exploit ring signatures to compute verification metadata needed for auditing the correctness of shared data. The identity of the signer on each block in shared data is kept to be private from public verifiers, who are able to efficiently verify shared data integrity without retrieving the entire file. Instead of verifying auditing tasks one by one we can do it simultaneously. The propose system is, a privacy-preserving public auditing mechanism for shared data in the cloud. In this we utilize ring signatures to construct homomorphism authenticators, so that a public verifier is able to audit shared data integrity without retrieving the entire data, but it cannot recognize who is the signer on each block. To make improvement in the efficiency of verifying multiple auditing tasks, we extends our mechanism to support batch auditing. There are two problems we can continue to study for our future work. One is traceability, this means the ability for the group manager to reveal the identity of the signer based on verification metadata in some special situations.

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