An Efficient Cloud Auditing Scheme for Data Integrity and Identity-Privacy of Multiple Uploaders

On the cloud, data are not only stored on multiple locations, but also shared across multiple users. The integrity of data on the cloud is subject to doubt due to cloud failures. Therefore, many techniques are available to verify the existence of data on the cloud without retrieving the entire file. However, the data auditing techniques reveal confidential information to the designated verifier which breach the identity of the data uploaders. This paper introduces a privacy-preserving scheme for multiple data uploaders over the cloud. In the proposed design, the identities of the data block signers are hidden from a Third Party Auditor (TPA). A Secure Hash Algorithm (SHA) is also employed to provide an integral auditing report between the data owner(s) and the TPA. The proposed design is tested and verified mathematically and experimentally using a set of synthesized data.