IEEE 2014: Oruta: Privacy-Preserving Public Auditing for Shared Data in the Cloud

IEEE 2014  Transactions on Cloud Computing

Technology - Available in Java

With cloud storage services, it is commonplace for data to be not only stored in the cloud, but also shared across multiple users. However, public auditing for such shared data — while preserving identity privacy — remains to be an open challenge. In this paper, we propose the first privacy-preserving  mechanism 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 when auditing shared data.