Proving Possession and Retrievability within a Cloud Environment: A Comparative Survey

Outsourcing data to a remote Cloud Service Provider (CSP) is a growing trend for numerous organizations alleviating the burden of local data storage and maintenance. While Cloud computing makes these advantages more appealing than ever, it also brings new challenging security threats towards user’s outsourced data. It’s of crucial importance to customers to have strong evidence that they actually get the service they pay for. Moreover, they need to verify that all their data copies are not being tampered with or partially deleted over time. As a result, data owners need to be convinced that their data are correctly stored in the Cloud. So, one of the biggest concerns with cloud data storage is that of data integrity verification at untrusted servers. In order to solve the problem of data integrity checking, many schemes are proposed under different systems and security models. In this paper we surveyed two core integrity proving schemes in detail along with different methods used for data integrity in both the schemes. Keywords— Cloud Service Provider, Provable Data Possession, Proof of Retrievability.