Homomorphic Authentication Scheme for Proof of Retrievability with Public Verifiability

Abstract

Cloud storages are the cloud computing model that stores, manages, and operates data storage as a service. These are widely used nowadays and are being adopted by many organizations or individuals. The ease of using cloud storage is that the users can upload the data in remote cloud storage and can be accessed by any device through the internet. These cloud storage are managed by cloud service providers. Despite having benefits, users don’t get physical access to the servers that store their data. Thus, users need some integrity verification techniques that confirm that data stored in the data center is intact. This paper presents the public verifiability service that provides integrity verification of data placed in the cloud. The proposed system is built on pseudorandom functions (PRFs) which rely on homomorphic linear property. We also considered the third party auditor (TPA) to confirm the integrity of cloud data through auditing. Our experimental study shows that the proposed method is provably secure.