Reputation systems have demonstrated their interest in stimulating cooperation in peer-to-peer (P2P) systems, even though they are susceptible to collusion and bashing. In addition, computing reputation generally relies on a partial assessment of the behavior of peers only, which might delay the detection of selfish peers. This situation is rendered even worse in self-organized storage applications, since storage is not an instantaneous operation and data are vulnerable throughout their entire storage lifetime. This paper compares reputation to an audit-based approach in which peer observations are carried out through the periodic verification of a proof of data possession, and show how the latter approach better addresses the aforementioned issues of inciting cooperation in P2P storage.
Reputation and audits for self-organizing storage
Research report RR-08-226
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