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In cloud storage service, clients upload their data together with authentication information to cloud storage server. To ensure the availability and integrity of clients' stored data, Cloud Server (CS) must prove to a verifier that it is actually storing all of the client's data unchanged. And, enabling public auditability for cloud storage is of critical importance to users with constrained computing resources, who can resort to a Third Party Auditor (TPA) to check the integrity of outsourced data. However, most of the existing proofs of retrievability schemes or proof of data possession schemes do not consider data privacy problem. Zero knowledge privacy requires TPA or the adversary cannot deduce any information of the file data from auditing system.
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