Integrity Verification of Replicated File with Proxy in Cloud Computing

摘要

In 2013, Wang designed an efficient proxy provable data possession scheme. However, Wang's scheme focuses on a single copy of the file and the client just delegates the integrity checking task to only one proxy, not multiple ones. In this paper, we extend Wang's scheme to apply to multiple replicas. We propose two proxy multiple-replica provable data possession schemes. In the first scheme, the client delegates the integrity checking task to only one proxy. In the second scheme, multiple proxies form a group, and the client delegates the integrity checking task to this group. In the two proposed schemes, only the client and the proxy (proxies) can guarantee that multiple replicas are correctness. Finally, we analyze the security and performance of the two schemes.