Public Proof of Retrievability Scheme against Active Attack in Cloud Storage

Data integrity is one of the major concerns with cloud data storage for cloud user. Besides, the cloud user’s constrained computing capabilities make the task of data integrity auditing expensive and even formidable. In recent years, many public data integrity verification schemes have been proposed, however, most of them are vulnerable to an efficient active attack, which means that the active adversary is able to arbitrarily modify the cloud data without being detected by the auditor. In this work, by utilizing blinding factor, we proposed a new proof of retrievability scheme, which can resist active attack and keep the privacy of the data in the auditing process. Extensive security analysis shows our proposed scheme is provably secure. Index Terms Cloud storage, proof of retrievability, active attack.