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The P2PRep algorithm is a reputation-management mechanism in which a peer uses fuzzy techniques to compute local reputations and aggregates these results to compute a global reputation for another peer which has made an offer of service. While this mechanism is known to be extremely effective in the presence of malicious peers, it has one drawback: it does not preserve the anonymity of peers in the network during the voting phase of protocol. This makes it unsuitable for use in networks which associate peers with a routing identifier such as an IP address.
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