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In both the commercial and defence sectors a compelling need is emerging for the rapid, yet secure, dissemination of information across traditional organisational boundaries. In this paper, the authors present a novel trust management paradigm for securing pan-organisational information flows that aims to address the threat of information leakage. This paper makes two important contributions. First, they quantify fundamental tradeoffs on information flow rate, information leakage rate and error in estimating recipient trust score R. Second, they present a suite of key encryption schemes that realise their trust-based encryption primitive and identify computation and communication tradeoffs between them.
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