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Trust is an important aspect of Peer-To-Peer (P2P) systems, because in such systems, peers are usually anonymous. A popular method for evaluating trust in P2P systems is to use reputation, where the reputation of a peer is determined based on its prior transactions with other peers. Since, no peer has easy access to global knowledge in a decentralized system, the main challenge of this reputation-based method is how to collect and distribute reputation scores of peers efficiently. While several solutions have been proposed to address this challenge, most of them rely on a gossiping algorithm, which is costly and communication-intensive.
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