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Incorporating Trust in the BitTorrent Protocol

Purvi Shah and Jehan-Franšois PÔris

International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2007)
San Diego, California (USA), July 16-18, 2007


We present a trust management system tailored to the needs of the BitTorrent protocol. Unlike other trust management systems, our system is partially decentralized and assumes unstructured BitTorrent swarms. In particular, we use the tracker of each BitTorrent swarm, to compute and distribute global trust scores complementing the local trust scores maintained by each peer. Our simulation study indicates that our system significantly minimizes the downloading by a rogue peer in the swarm. We also found out that it resulted in a fairer allocation of chunks among peers with different link bandwidths.

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