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Cloud storage is a new business solution for remote backup outsourcing, as it offers an abstraction of infinite storage space for clients to host data backups in a pay-as you-go manner. However it is indispensable for cloud service providers (CSPs) to provide security techniques for managing their storage services. We tackle this issue by implementing the framework for multicloud storage in which the client's data is manipulated with fine grained policy based access control. In addition an efficient cooperative Provable data possession (CPDP) scheme is designed which offers an efficient verification on the integrity and availability of stored data. The proposed system includes addressing two security issues. First provide guarantees of access control in which only authorized parties can access the outsourced data. Second provides cooperative PDP scheme to support dynamic scalability on multiple storage servers. Extensive security and performance analysis show that the proposed schemes are highly efficient and provably secure.

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