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Cloud storage enables data owners to use any device to store and access data anytime, anywhere. In a data auditing scheme, the data owner can entrust a third party auditor (TPA) to verify that the outsourced data remains unchanged. A secure data auditing scheme not only detects whether cloud service providers (CSP) maintain data integrity, but also prevents TPA from stealing data. In this paper, a new identity-based data auditing (IBDA) scheme for cloud storage systems is proposed. In the scheme, the data owner generates the tags using its private key and data blocks, and then uploads the data blocks along with the tags to CSP. In the challenge-proof phase, before returning the proof information, CSP performs the addition operation between the hash function value and the data block to hide the data, thereby preventing TPA from stealing the data. This scheme is proved to be secure in the random oracle model. Analysis of efficiency shows that it is more efficient than other schemes.

A Lightweight Identity-Based Remote Data Auditing Scheme for Cloud Storage