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Chapter Nine - EigenTrust > 9.2 Reputation Systems

9.2 REPUTATION SYSTEMS

An important example of successful reputation management is the online auction system eBay [25]. In eBay’s reputation system, buyers and sellers can rate each other after each transaction, and the overall reputation of a participant is the sum of these ratings over the last 6 months. This system relies on a centralized system to store and manage these ratings.

In a distributed environment, peers may still rate each other after each transaction, as in the eBay system. For example, each time peer i downloads a file from peer j, it may rate the transaction as positive (tr(i, j) =1) or negative (tr(i, j) = − 1). Peer i may rate a download as negative, for example, if the file downloaded is inauthentic or tampered with, or if the download is interrupted. As in the eBay model, we may define a local trust value si j as the sum of the ratings of the individual transactions that peer i has downloaded from peer


  

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