A Survey On data using convergent encryption for cloud data storage

Abstract

In cloud storage accommodations, Deduplication technology is commonly used to reduce the space and bandwidth requisites of accommodations by eliminating redundant data and storing only a single replica of them. Deduplication     is most efficacious when multiple users outsource the same data to the cloud storage, but it raises issues relating to security and ownership. Proof of- ownership schemes sanction any owner of the same data to prove to the cloud storage server that he owns the data in a robust way. However, many users are liable to encrypt their data afore outsourcing them to the cloud storage to preserve privacy, but this hampers Deduplication     because of the randomization property of encryption. Recently, several Deduplication     schemes have been proposed to solve this quandary by sanctioning each owner to apportion the same encryption key for the same data. However, most of the schemes suffer from security imperfections, since they do not consider the dynamic vicissitudes in the ownership of outsourced data that occur frequently in a practical cloud storage accommodation. In this paper, we propose a novel server-side Deduplication    scheme for encrypted data. It sanctions the cloud server to control access to outsourced data even when the ownership changes dynamically by exploiting randomized convergent encryption and secure ownership group key distribution. This averts data leakage not only to revoked users albeit they aforetime owned that data, but withal to a veracious-but-curious cloud storage server. In advisement, the proposed scheme guarantees data integrity against any tag erraticism attack. Thus, security is enhanced in the proposed scheme. The efficiency analysis results demonstrate that the proposed scheme is virtually as efficient as the antecedent schemes, while the supplemental computational overhead is negligible.