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Preserving Client Privacy and Designate Verifier Data Auditing in Cloud Storage JiangXu 1 ,2 , JinHan 1,2 ,Yongjun Ren 1,2 , Jin Wang 1 ,2 1 Jiangsu Engineering Center of Network Monitoring，Nanjing University of Information Science & Technology, Nanjing 210044, China 2 Computer and Software School, Nanjing University of Information Science & Technology, Nanjing 210044, China. Abstract: Cloud storage is now an important development trend in information technology. To ensure the integrity of data storage in cloud storing, researchers have present some proof of storage schemes. In some cases, the ability to check data possession is delegated by data owners. Hence, the delegable provable data possession and proxy provable data possession are proposed. However the schemes are not secure since the proxy or designated verifier stores some delegation information in cloud storage servers. In this paper, we propose PC-DV POS scheme, which can preserve clients’ privacy and designate a verifier by the client signed the data blocks. In particular, we utilize group signatures and key exchange to construct homomorphic authenticators, so that only the designated verifier is able to check the integrity of shared data for users without retrieving the entire data, and cannot reveal the identities of signers on all blocks in shared data. 1 Introduction Cloud computing can provide a flexible, dynamic, resilient and cost effective infrastructure for both academic and business environments. In the cloud paradigm, data owners move the large data files from their local computing systems to the remote servers, in which the data owners avoid the initial investment of expensive infrastructure setup, large equipment, and daily maintenance cost. But, security becomes one of the major concerns for all entities in cloud services. In order to solve the problem of data integrity verification, many proof of storage (POS) schemes are proposed under different systems and security models [1-15]. In this paper, we propose a new private POS scheme, i.e., PC-DV POS, which can preserve clients’ privacy and at the same time designate a verifier by the client signed the data blocks. In particular, we utilize group signatures and key exchange to construct homomorphic authenticators, so that only the designated verifier is able to check the integrity of shared data for users without retrieving the entire data, and cannot reveal the identities of signers on all blocks in shared data. Moreover the original client, who creates and shares the data in the cloud, is able to add new clients into a group without re-computing any verification information. In addition, the original user can act as the group manager to trace group signatures on shared data, and reveal the identities of signers when it is necessary. Advanced Science and Technology Letters Vol.79 (IST 2014), pp.113-117 http://dx.doi.org/10.14257/astl.2014.79.22ISSN: 2287-1233 ASTL Copyright © 2014 SERSC