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...China (No. 20100203110002), Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT 1078). • Most part of this work was done at University of Toronto. A preliminary version =-=[1]-=- of this paper is in Proceedings of the 32nd IEEE International Conference on Computer Communications (IEEE INFOCOM 2013). would like to utilize cloud data for particular purposes (e.g., search, compu...

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...cure roaming schemes, the privacy preservation only equates with anonymity, i.e., hiding users’ identities. However, this may not be suitable for diverse privacy requirements in real world [4], [20], =-=[21]-=-, [22], [23]. There are a variety of personalized services associated with privacy in the real applications; therefore, according to different privacy preservation requirements, the privacy preservati...

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... However, it is possible for the TPA to get the client’s data after it executes the auditing protocol multiple times. Auditing protocols in [9, 10] are designed to ensure the privacy of the client’s data in cloud. Another aspect having been addressed in cloud storage auditing is how to support data dynamic operations. Wang et al. [11] have proposed an auditing protocol supporting fully dynamic data operations including modification, insertion and deletion. Auditing protocols in [2, 9, 12, 13] can also support dynamic data operations. Other aspects, such as proxy auditing [14], user revocation [15] and eliminating certificate management [16] in cloud storage auditing have also been studied. Though many research works about cloud storage auditing have been done in recent years, a critical security problem—the key exposure problem for cloud storage auditing, has remained unexplored in previous researches. While all existing protocols focus on the faults or dishonesty of the cloud, they have overlooked the possible weak sense of security and/or low security settings at the client. In fact, the client’s secret key for cloud storage auditing may be exposed, even known by the cloud, due to se...

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...Wang et al. [22] presented a dynamic scheme with by integrating above CPOR scheme and Merkle Hash Tree in DPDP. Wang et al. [17] provided a privacy-preserving auditing protocol. This scheme achieves batch auditing to support efficient handling of multiple auditing tasks. In 2011, based on fragment structure, random sampling and index-hash table, Zhu et al. [28] propose a dynamic audit service for verifying the integrity of an untrusted and outsourced storage, which supporting provable updates to outsourced data, and timely abnormal detection. Since then, many other auditing mechanisms such as [13, 14, 15, 16, 18, 19, 23, 24, 25, 26, 27] have been proposed for protecting the integrity of the data in the cloud. In 2013, Wang boyang et al. [15] proposed a novel public auditing mechanism for the integrity of shared data with efficient user revocation. By utilizing proxy re-signatures, it allows the cloud to re-sign blocks on behalf of existing users during user revocation phase, so that existing users do not need to download and re-sign blocks by themselves. In addition, a public verifier is always able to audit the integrity of shared data without retrieving the entire data from the cloud, even if some part of shared data has b...

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... accessing cloud the existing user of that cloud must resign data signed by the revoked user to resigned data user must download the entire data and signed it. This difficulty is rectified with novel public auditing mechanism. Keyword: - Public Auditing, Cloud Computing, user revocation, data recovery. 1. INTRODUCTION Cloud storage services, is common place for cloud shared across multiple users and cloud data to be stored. Public auditing for shared data, while preserving identity privacy remains to be an open ultimate test. When we share data among various users, it encourages cloud storage [1]. The way to preserve identity privacy from the TPA, because the identities of signers on shared data may point out that a desired user in the group is a higher valuable target than others, which is one of the sign ificant problem introduced during public auditing for shared data in the cloud. We apply our project so as to accentuate the efficiency of user revocation in the cloud and provides highly developed scheme for cloud data signatures and thus avoiding unnecessary loss of time of the user to sign these data blocks again and again. Digital signature is a scheme use for demonstrating the ...