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Cloud computing is a major emerging technology that is significantly changing industrial computing paradigms and business practices. However, security and privacy concerns have arisen as obstacles to widespread adoption of clouds by users. While much cloud security research focuses on enforcing standard access control policies typical of centralized systems, such policies often prove inadequate for the highly distributed, heterogeneous, data-diverse, and dynamic computing environment of clouds. To adequately pave the way for robust, secure cloud computing, future cloud infrastructures must consider richer, semantics-aware policies; more flexible, distributed enforcement strategies; and feedback mechanisms that provide evidence of enforcement to the users whose data integrity and confidentiality is at stake.
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