Because the P2P network's trust mechanism receives frequently cheat and attack from the malicious nodes, this paper identified four vulnerabilities that are detrimental to trust management, and presented a vague set-based anti-attacked trust model. This model used degree of membership to measure trust degree of uncertainty information, employed the time sensitive coefficient and the penalty coefficient to deal with direct feedback information of resource provider, and introduced similarity of vague set to evaluate feedbacks in recommended nodes. This paper presented practice schemes and simulation experiments of trust model, the results showed that this trust model can resist various cheat and attack behaviors.
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