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The Cloud computing is a leading technology which provides various services to users such as allows users to store their data on a cloud without worrying about correctness & integrity of data, use on-demand high quality applications and services. But as data is stored at the remote place how users will get the confirmation about data stored on the cloud. Hence Cloud data storage must have some mechanism which will specify storage correctness and integrity of data stored on a cloud. Enabling public auditability for cloud storage is of critical importance so that users can resort to a third party auditor (TPA) to check the integrity of outsourced data and be worry-free. In this paper, review on innovative idea for secure cloud storage system supporting privacy-preserving public auditing. The results are also extended to enable the TPA to perform audits for multiple users simultaneously and efficiently. It supports data dynamics where the user can perform different operations on data such as insert, update and delete as well as batch auditing where multiple user requests for storage correctness will be handled simultaneously which decrease communication and also computing cost.