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In cloud computing, data is moved to a remotely located cloud server. Cloud faithfully stores the data and return back to the owner whenever needed. But there is no guarantee that data stored in the cloud is secured and not altered by the cloud or Third Party Auditor (TPA). In order to overcome the threat of integrity of data, the user must be able to use the assist of a TPA. The TPA has experience in checking integrity of the data, that clouds users does not have, and that is difficult for the owner to check. The data in the cloud should be correct, consistent, accessible and high quality.
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