期刊名称：International Journal of Computer Science Issues
印刷版ISSN：1694-0784
电子版ISSN：1694-0814
出版年度：2011
卷号：8
期号：6
出版社：IJCSI Press
摘要：Currently, there has been an increasing trend in outsourcing data to remote cloud, where the people outsource their data at Cloud Service Provider(CSP) who offers huge storage space with low cost. Thus users can reduce the maintenance and burden of local data storage. Meanwhile, once data goes into cloud they lose control of their data, which inevitably brings new security risks toward integrity and confidentiality. Hence, efficient and effective methods are needed to ensure the data integrity and confidentiality of outsource data on untrusted cloud servers. The previously proposed protocols fail to provide strong security assurance to the users. In this paper, we propose an efficient and secure protocol to address these issues. Our design is based on Elliptic Curve Cryptography and Sobol Sequence (random sampling). Our method allows third party auditor to periodically verify the data integrity stored at CSP without retrieving original data. It generates probabilistic proofs of integrity by challenging random sets of blocks from the server, which drastically reduces the communication and I/O costs. The challenge-response protocol transmits a small, constant amount of data, which minimizes network communication. Most importantly, our protocol is confidential: it never reveals the data contents to the malicious parties. The proposed scheme also considers the dynamic data operations at block level while maintaining the same security assurance. Our solution removes the burden of verification from the user, alleviates both the users and storage services fear about data leakage and data corruptions. Through security analysis, we prove that our method is secure and through performance and experimental results, we also prove that our method is efficient. To compare with existing schemes, our scheme is more secure and efficient.
