Abstract
Day by day the usage of smart devices is increasing and communication between devices which improves data growth in cloud storage. The growth of data affects the performance of storage system. The data deduplication system can optimize performance of data storage by eliminating redundant data, reducing storage cost and improves storage utilization. Deduplication technique classified into few types based on that it produces results. Along with that data deduplication performs on encrypted data will be used to prevent unauthorized users from accessing data. Subsequently, various methods perform deduplication (file or block level) safely over encrypted data in cloud. This paper represents different methods which have used different deduplication technique.
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