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The Scientific World Journal
Volume 2014, Article ID 820391, 10 pages
Research Article

A Secure and Efficient Audit Mechanism for Dynamic Shared Data in Cloud Storage

Department of Computer Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea

Received 29 January 2014; Accepted 26 February 2014; Published 12 May 2014

Academic Editors: Y. Pan and J. J. Park

Copyright © 2014 Ohmin Kwon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


With popularization of cloud services, multiple users easily share and update their data through cloud storage. For data integrity and consistency in the cloud storage, the audit mechanisms were proposed. However, existing approaches have some security vulnerabilities and require a lot of computational overheads. This paper proposes a secure and efficient audit mechanism for dynamic shared data in cloud storage. The proposed scheme prevents a malicious cloud service provider from deceiving an auditor. Moreover, it devises a new index table management method and reduces the auditing cost by employing less complex operations. We prove the resistance against some attacks and show less computation cost and shorter time for auditing when compared with conventional approaches. The results present that the proposed scheme is secure and efficient for cloud storage services managing dynamic shared data.