Abstract: During the last decade, cloud computing technology becomes an attractive trend of leveraging cloud based services for large scale content storage, processing and distribution. Thus, data deduplication becomes more and more a necessity for cloud service provider. Also security and privacy are top concern for the public cloud. Aiming to address the above storage and security challenges, this paper makes the attempt to formalize the notion of secured and efficient cloud storage system. We developed a prototype consist of client side deduplication for the security, storing and sharing outsourced data using the hybrid cloud. As a proof of our framework, we implement prototype and demonstrate that the incurred overhead is very limited in realistic environment.

Keywords: Deduplication, convergent encryption, differential privileges, hybrid cloud.