Richa Kumar

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We present a system architecture for supporting ubiquitous computing for mobile users across different environments by transparently performing context-based discovery and binding of resources. A ubiquitous computing environment is viewed as a collaboration space among mobile users, system services, and sensors/resources embedded in the physical(More)
We present here the execution model of a policy-driven middleware for building secure distributed collaboration systems from their high level specifications. Our specification model supports nested collaboration activities, and uses role-based security policies and event count based coordination specification. From the specifications of a collaboration(More)
The focus of this paper is on a specification model for defining security and coordination policies for distributed collaboration and workflow systems. This work is motivated by the objective to build distributed collaboration systems from their high level specifications. We identify here unique requirements for secure collaboration, specifically role(More)
Our goal is to construct secure distributed collaboration systems by coupling their high-level specifications with a policy-driven middleware. This paper addresses three problems related to decentralized management of collaboration systems by a middleware. To correctly enforce security and coordination policies, the middleware determines which nodes can be(More)
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