Many trends are opening up the era of Cloud Computing, which is an Internet-based development and use of computer technology. Consider the large size of the outsourced electronic data and the client’s constrained resource capability, the core of the problem can be generalized as how can the client find an efficient way to perform periodical integrity verifications without the local copy of data files. The main objective of this paper is to provide security in terms of integrity and availability of client’s data which is stored on cloud. This paper shall not put any burden on to computation and communication and further, performance guarantee shall also be taken care of by allowing trusted third party to verify the correctness of the cloud data on demand without retrieving a copy of the whole data or introducing additional on-line burden to cloud users. If you use public verification, the owner (client) can be verified (challenge) phase separation, will want to verification task of entrusted to a third party to perform, but also because the owner of a trusted third party may have to better and more efficient than the hard physical equipment and computing power, it can improve the efficiency of verification. At this point, the owner do not have to produce itself verification of the server, do not have to verification proof of the value coming from the server, only to appoint tasks to a third party, which greatly reduce the owner’s cost of computing and storage costs. Therefore, we further modify the static PDP protocol, and this stage is a hybrid variation of the static type of PDP is to provide publicly verify the characteristics of this phase can allow anyone to verify the correctness of data stored on the server.
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