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With the continuous and exponential growth in users and increase in their data size, data de-duplication becomes more and more necessity for cloud storage providers. Data de-duplication is important data compression technique which eliminates duplicate copies of repeating data, and has been widely used in cloud storage to reduce the amount of storage space and save bandwidth. De-duplication can be performed on file level as well as block level. We are considering these both approaches. Convergent encryption has been introduced to maintain security while supporting de-duplication. To enhance data security and achieve confidentiality this paper formally addresses the problem of authorized data de-duplication. Duplicate check is based on differential privileges of users. Duplicate check is carried on data itself. To retain the privacy of sensitive data concept of hybrid cloud is proposed. Several new de-duplication constructions supporting authorized duplicate check in hybrid cloud architecture are proposed. Security analysis demonstrates that our scheme is secure in terms of the definitions specified in the proposed security model. As a proof of concept, we implement a prototype of our proposed authorized duplicate check scheme and conduct tested experiments using our prototype. We show that our proposed authorized duplicate check scheme incurs minimal overhead compared to normal operations.
