In recent, Cloud computing is booming technology and the major service provided by the cloud is storage as service. Keywords:- Hybrid cloud, Confidentiality, Deduplication, Authorized duplication check. In this paper we are using network storage system called as venti which is used to reduce the duplication and also providing data security by using cryptography hash function. We also existing several new deduplication improvements supporting authorized duplicate sign on a hybrid cloud architecture. Different through traditional deduplication methods, the differential privileges of users are usually further considered throughout duplicate check in addition to the data itself. To higher protect data safety, this paper makes the first effort to properly address the condition of authorized information deduplication.

To declare the user control over access to their own data, it is a capable method to encrypt the data before outsourcing. On the other hand, there have been recently wide privacy considerations as data could come in contact with those third party servers also to unauthorized parties. ABSTRACT Data deduplication is certainly one of important data compression techniques for eliminate duplicate data of repeating information, and has been widespread in cloud storage devices to reduce the number of storage space and also save bandwidth.

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