Abstract: “This cloud computing to realize being shifted into the next generation with. Application software and database are stored has changed. Now they cloud data centers in which safety is a concern from the point of view of the client are stored in the. Batteries that store and manage data without capital investment are used which are not well understood is the many security challenges paper cloud data integrity and security of data stored in the servers is focused on data integrity verification is a third party auditor that data integrity check from time to time on behalf of the client is authorized to use. Customer data from third party auditor of information gets lost when data integrity is not only data integrity verification, the proposed system also supports data mobility. The work that has been done in this online data mobility to public audit and sham Supporting. Audit for inserting and deleting data modifications functions, monitors the proposed system’s ability to audit both public”

Keywords: Data Security, Cloud server, data dynamic, multiple clients, Third Party Auditor, Hash Tree, Data Blocks,CSS.