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Cloud Computing has been envisioned as the next-generation architecture of IT Enterprise. In contrast to traditional solutions, where the IT services are under proper physical, logical and personnel controls, Cloud Computing moves the application software and databases to the large data centers, where the management of the data and services may not be fully trustworthy. This unique attribute, however, poses many new security challenges which have not been well understood. This paper focuses on cloud data storage security, which has always been an important aspect of quality of service. To ensure the correctness of users' data in the cloud, one proposes an effective and flexible distributed scheme with two salient features, opposing to its predecessors.
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