With new technology such as cloud computing emerging, parties communicate directly with each other to exchange files or execute transaction in a peer-to-peer fashion. Therefore, peers have to manage the risks involved in the collaboration when prior experience and knowledge about each other are imcomplete. The behaviors of a party are undertain and attributes of a party, requested objects, and context information are mutable. To address above changllenges, we integrate Dirichlet reputation into usage control to manage authentication and authorization in a collaborative enviornment. We added moving window mechanism to the Dirichlet reputation evaluation. Moving windows not only help to adjust our responsiveness of our system to changes in peers' behaviors, but also allow us to use different strategies to react to different group of peers. Our system offers a way to handle uncertainty and mutability by dynamically revoke granted privileges from a party due to low reputation or changed attributesand context information.
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