Abstract: Cloud storage services use cross-user deduplication techniques to maintain unique copies of duplicate data. Client-side deduplication detects and prevents duplicates at the client before the data is sent across the network bringing in huge benefits in terms of network bandwidth. However, these techniques are prone to security breaches. Proof of Ownership (PoW) is a cryptographic concept that requires a client to prove to the server that it possesses the data before the server accepts its upload request and marks the client as the owner of the data. In this paper, a secure PoW technique for cloud storage systems is presented by overcoming the drawbacks of existing research works such as overhead due to pre-computed challenges, third party entities and I/O computational overhead.The proposed solution is implemented in OpenStack Cloud environment for the proof of practicability. A trusted entity called Pseudo Open Stack Manager (POM) is introduced for enhancing security which acts as an interface isolating the cloud storage from malicious users. POM is assumed to be a part of the cloud storage system. The security and performance of the proposed solution is evaluated and the results demonstrate significant improvement in the upload bandwidth usage and efficient use of storage space without compromising security.
S. Umamaheswari, T. Purusothaman, N P. Supriya and Arun Thundyill Saseendran, 2016. A Secured Proof of Ownership and Enhanced Deduplication Scheme for Cloud Storage. Asian Journal of Information Technology, 15: 3801-3809.