Fair and dynamic proofs of retrievability

Abstract

One of the big trends of computing nowadays is cloud computing. More users rely on cloud computing for data storage because of its usefulness and mobility. However, the cloud server may be untrustworthy and may modify or manipulate the outsourced data without our knowing. The scheme we are presenting in this paper has the ability to spot any abnormality in the data stored and also retrieve back the lost data in some cases. It also supports dynamic data (data that can be modified, inserted or deleted). That means the authentication data can be updated as soon as the outsourced data are changed. The scheme also protects an honest cloud server over a dishonest client.