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Sunday, 17 June 2018


ABSTRACT Cloud is a type of platform which helps to store the data as well as helps in sharing the data. While sharing the huge amount of data, the primary concern comes to mind is data integrity, security of the data. For the cloud server and the user, it is not possible to check the integrity, consistency of stored data on the cloud. Public Auditing method can help to overcome this problem. Hence the user takes help of the third party auditor (TPA) for auditing their data. Many of the techniques have been proposed by various researchers which improve upon one another. Here we have presented three landmark methodologies on Privacy preserving cloud auditing for shared data on the cloud.

 KEYWORDS: Cloud computing; public auditing; PDP; WWRL; ORUTA; TPA.


 Cloud Computing is an upcoming new technology which provides the on-demand facility of a shared pool of resources (computing resources) (e.g., computer storage, applications and other resources), which can include rapid allocation and freedom with minimum number of efforts. Cloud computing and storage solutions provide individual users and companies with variety of capabilities to store and work on their data in data centers which are not owned by them and the location may be remote, may be across a city or across continents. Cloud computing provides sharing of resources to achieve economy of scales. The users use this cloud for sharing and the collaboration of their data with many other users in the group. Data sharing has become need in today’s world and it is provided in most of the cloud storage offerings, via Dropbox, Google. The data integrity in cloud storage, is a subject to skepticism and inspection, as there is always this fear of data being stored in an environment where there is a chance of getting lost or corrupted[1]. The need of the Third Party Auditor (TPA) is very necessary for ensuring the integrity of the data. Allowing public auditability for cloud storage is important so that users assign a third- party auditor (TPA) for the checking of the integrity of outsourced data and TPA offers its auditing service with more commanding computation and abilities of the communication than regular users. If we mention information, Wang et al. designed to construct a mechanism of public auditing system for cloud data, so that during public auditing process, the contents of the private data that belong to a personal user is not revealed to the third party auditor. Sharing data among the multiple users is one of the features in the motivation of cloud storage. A unique problem that is introduced during the whole process of public auditing for the shared data in the cloud is how we should reserve the identity secrecy from the TPA, because the identities of each signer on shared data may show that a particular user among the group of users or special blocks in shared data is amore valuable object than others. Such information is very confidential to the group and should not be shown to any third party as there is data shared. In this paper, we have also studied Oruta , a new privacy-preserving public auditing mechanism for shared data in an untrusted cloud.

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