An Effective Early Warning Scheme Against Pollution Dissemination for BitTorrent

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Executive Summary

BitTorrent is one of the most popular P2P file sharing systems. However, chunk-based file sharing mode makes it difficult to detect content pollution and prevent pollution dissemination during downloading process. In this paper, the authors propose an early warning scheme against pollution dissemination for BitTorrent. Their idea is to build an early cooperative warning mechanism and rapidly spread alert message among peers in the swarm when pollution is detected at the early stage, which is called "Early warning, quickly reacting". The performance evaluation based on fluid model shows the necessity and effectiveness of their scheme, which effectively reduces the traffic abusement and restricts pollution dissemination in BitTorrent-like P2P networks.

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