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With emerging Internet-scale open content and resource sharing, social networks, and complex cyber-physical systems, trust issues become prominent. In this paper, the authors propose a trust vector based scheme (VectorTrust) for aggregation of distributed trust scores. Leveraging a Bellman-Ford based algorithm for fast trust score aggregation, VectorTrust features localized and distributed concurrent communication. A VectorTrust-enabled system is decentralized by nature and does not rely on any centralized server or centralized trust aggregation. They design, implement, and analyze trust aggregation and trust management strategies. To evaluate the performance, they design and implement a VectorTrust Simulator (VTSim) in an unstructured P2P network.
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