Oruta Privacy-Preserving Public Auditing for Shared Data in the Cloud

Oruta: Privacy-Preserving Public Auditing for Shared Data in the Cloud

With cloud storage services, it is commonplace for data to be not only stored in the cloud, but alsoshared across multiple users. However, public auditing for such shared data – while preserving identityprivacy – remains to be an open challenge. In this paper, we propose the first privacy-preservingmechanism that allows public auditing on shared data stored in the cloud. In particular, we exploit ring signatures to compute the verification information needed to audit the integrity of shared data. With our mechanism, the identity of the signer on each block in shared data is kept private from a third party auditor (TPA), who is still able to verify the integrity of shared data without retrieving the entire file. Our experimental results demonstrate the effectiveness and efficiency of our proposed mechanism whenauditing shared data.

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