Protegendo BitTorrent: Projeto e Avaliação de Contra-Medidas Eficazes para Ataques DoS

Daniel BauermannMatheus LehmannRodrigo MansilhaMarinho P. Barcellos

BitTorrent is a P2P file-sharing protocol that can be used to efficiently distribute files such as software updates and digital content to very large numbers of users. In a previous paper, we have shown that vulnerabilities can be exploited to launch Denial-of-Service (Dos) attacks against BitTorrent swarms. In this paper, we review the three most damaging attacks, and propose two algorithms as countermeasures to effectively tackle them. We implemented the attacks and countermeasures in TorrentSim, a packet-level BitTorrent simulator. The results indicate that our proposed approach is effective when there is an on-going attack while at the same time efficient when the countermeasure is active but there is no attack.

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