A PDP-Based Integrity Checking Protocol. Ateniese et al proposed a protocol based on the provable data procession (PDP) technology, which allows users to obtain a probabilistic proof from the storage service providers. Such a proof will be used as evidence that their data have been stored there. One of the advantages of this protocol is that the proof could be generated by the storage service provider by accessing only a small portion of the whole dataset. At the same time, the amount of the metadata that end users are required to store is also small—that is, O. Additionally, such a small amount data exchanging procedure lowers the overhead in the communication channels too. As part of pre-processing procedure, the data owner client) may conduct operations on the data such as expanding the data or generating additional metadata to be stored at the cloud server side. The data owner could execute the PDP protocol before the local copy is deleted to ensure that the uploaded copy has been stored at the server machines successfully. Actually, the data owner may encrypt a dataset before transferring them to the storage machines.
