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Cloud Computing May Be Defined As Delivery Of Product Rather Than Service. Cloud Computing Is A Internet Based Computing Which
Enables Sharing Of Services. Many Users Place Their Data In The Cloud. However, The Fact That Users No Longer Have Physical Possession Of
The Possibly Large Size Of Outsourced Data Makes The Data Integrity Protection In Cloud Computing A Very Challenging And Potentially Formidable Task, Especially For Users With Constrained Computing Resources And Capabilities. So Correctness Of Data And Security Is A Prime Concern.
This Article Studies The Problem Of Ensuring The Integrity And Security Of Data Storage In Cloud Computing. Security In Cloud Is Achieved By
Signing The Data Block Before Sending To The Cloud. Signing Is Performed Using Boneh–Lynn–Shacham (BLS) Algorithm Which Is More Secure
Compared To Other Algorithms. To Ensure The Correctness Of Data, We Consider An External Auditor Called As Third Party Auditor (TPA), On
Behalf Of The Cloud User, To Verify The Integrity Of The Data Stored In The Cloud. By Utilizing Public Key Based Homomorphic Authenticator With
Random Masking Privacy Preserving Public Auditing Can Be Achieved. The Technique Of Bilinear Aggregate Signature Is Used To Achieve Batch
Auditing. Batch Auditing Reduces The Computation Overhead. Extensive Security And Performance Analysis Shows The Proposed Schemes Are
Provably Secure And Highly Efficient.