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We have developed a security model that facilitates control of resources by autonomous peers who act on behalf of collaborating users. This model allows a gradual build-up of trust. It enables secure interactions among users that do not necessarily know each other and allows them to build trust over the course of their collaboration. This paper describes(More)
Free flow of information is the feature that has made peer-to-peer information sharing applications popular. However, this very feature holds back the acceptance of these applications by the corporate and scientific communities. In these communities it is important to provide confidentiality and integrity of communication and to enforce access control to(More)
A secure collaboration environment should be designed to support informal, spontaneous collaborations as well as highly structured environments. Using on-line tools, it should be easy to begin collaborating, and incrementally add users and services as needed. Ideally, the collaboration environment should not depend on any specific resource or server;(More)
Today's distributed systems require simple and powerful resource discovery queries in a dynamic environment consisting of a large number of resources spanning many autonomous administrative domains. The distributed search problem is hard due to the variety of query types, the number of resources and their autonomous, partitioned and dynamic nature. We(More)
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