Cloud computing deals with the practice of using a network of remote servers hosted on the Internet to store, manage, and process data, rather than a local server or a personal computer. The most important and popular cloud service is data storage. The data which is of primary importance is stored in an encrypted manner over the cloud so as to maintain its privacy. Hackers can access the data and can cause serious damages to the proprietary data and for its privacy concern data is stored in encrypted form. Now in cloud storage, deduplication technique is used by cloud service provider (CSP) to maintain the space complexity, privacy and to avoid redundancy. This is done by avoiding duplication of data and maintains a single copy of that particular file. However in the management of big data using encrypted manner for deduplication files is tedious task. Traditional deduplication scheme cannot work in encrypted manner because encrypted data are saved as different contents by applying different encryption keys. Whereas the present scenario of deduplication scheme lacks privacy or it is suffered from weakness in providing privacy. In this paper, we propose a scheme to deduplicate encrypted data stored in cloud based on ownership challenge and proxy reencryption. It integrates cloud data deduplication with access control. We evaluate its performance based on extensive analysis and computer simulations. The results show the superior efficiency and effectiveness of the scheme for potential practical deployment, especially for big data deduplication in cloud storage.

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