A Study on Deduplication Techniques over Encrypted Data

In the current digital world, data is of prime importance for individuals as well as for organizations. As the amount of data being generated increases exponentially with time, duplicate data contents being stored cannot be tolerated. Thus, employing storage optimization techniques is an essential requirement to large storage areas like cloud storage. Deduplication is a one such storage optimization technique that avoids storing duplicate copies of data. Currently, to ensure security, data stored in cloud as well as other large storage areas are in an encrypted format and one problem with that is, we cannot apply deduplication technique over such an encrypted data. Thus, performing deduplication securely over the encrypted data in cloud appears to be a challenging task. Various methods that address this challenge are studied in this paper.