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Cloud Computing has been visualizing as the next generation architecture of IT Enterprise, in contrast to square solutions. With cloud computing and storage services, data is not only stored in the cloud, but regularly shared among a large number of users in a group. To address these problems, our work utilizes the technique of public auditing, which enables TPA (Third party Auditor) to perform the auditing without demanding the local copy of data and as a result drastically reduces the announcement and computation overhead. OPoR, privacy based preserving auditing scheme to shared data with large groups in the cloud and utilize merkle hash tree with signature to compute confirmation in order on shared data, so that the TPA is able to audit the exactness of public data, but cannot reveal the identity of the signer on each block. Finally proposed auditing scheme is to perform efficient public auditing to protect both identity and data privacy in cloud environment and extend our work to implement double encryption approach to provide additional security in cloud storage environments.