TC: Small: Collaborative Research: Towards a Dynamic and Composable Model of Trust

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People rely on two types of trust when making everyday decisions:vertical and horizontal trust. Vertical trust captures trustrelationships between individuals and institutions, while horizontaltrust represents the trust inferred from the observations and opinionsof other peers. Although significant benefit could be realized bycombining horizontal and vertical trust mechanisms, they have evolvedindependently in computing systems.This project focuses on developing a composable trust model capable oftightly coupling vertical and horizontal trust in a manner that isboth amenable to formal analysis and efficiently deployable. Thisresearch advances the state of the art in trust management through aseries of innovative results, including the design of a unifiedframework for specifying composite trust policies and the design andanalysis of efficient algorithms for policy evaluation. The compositetrust management approach championed by this project also enablespolicy authors to move beyond simple proof of compliance to identifythe "top-k" preferred users satisfying security policies includingsubjective assessments. The beneficiaries of this research range fromadministrators of traditional computing systems who can betterincorporate previous history into their decision-making processes, tousers in social networks who can more carefully manage the exposure oftheir personal data.