A Review on Secure Data Deduplication: Cloud Storage Security Issue

Cloud storage service providers caters to the need of organizations and individuals by allowing them to store, transfer and backup their ever-increasing amount of data at low cost along with providing access to the other resources of cloud. For providing efficient data storage, cloud service providers utilize most widely employed deduplication technique as it allows storage of single instance of data and removes duplicate copies of data, thus mitigating storage overhead and saving upload bandwidth. Clients uploading their data on cloud are most concerned about the security, integrity, privacy and confidentiality of their data. Conventional encryption usually employed to encrypt data while outsourcing it, is not recommended as it conflicts with data deduplication technique and so in most cases, Convergent Encryption (CE) and Proof of Ownership (PoW) are used to protect confidentiality and integrity of data. Several other approaches such as Provable Data Possession (PDP), Proof of Retrievability (POR), secure keyword search, DupLESS, Proof of Storage with Deduplication (PoSD), Dekey, Message-Locked Encryption, Attribute Based Encryption (ABE) and Identity Based Encryption (IBE) have been researched to address client’s security concerns and this paper does a literature review on such various proposed approaches for secure deduplication techniques in cloud storage.