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In Vehicular Ad Hoc NETworks (VANET), trust establishment among communicating vehicles is important to be built to secure messages' exchange and reliability. In this paper, the proposed scheme presents a categorized decentralized trust management evaluation scheme for nodes in vehicular ad hoc environments. Each node is evaluated individually according to its interactions during event reporting. Based on this evaluation, a node is assigned a category level (according to its trust value) and a confidence measure, which determines the degree of trustworthiness of nodes' generated reports during broadcasting.
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