Science and Development Network (SciDev.Net)
Integrity checking becomes imperative to secure data in a cloud environment. In this paper, the authors propose Server Re-Tag Provable Data Possession (SRT-PDP). By utilizing proxy re-signatures, they allow the cloud severs as the group manager to re-sign blocks after the client sign the shared data, so that existing clients do not have to do anything even if some clients leave the group. In addition, a public verifier is always able to audit the integrity of shared data without retrieving the entire data from the cloud servers. SRT-PDP enable the cloud server takes the most of the work, and reduce the burden of client, which is suit for mobile device.