Análise do Impacto de Ataques de Poluição Combinado com Whitewashing em Sistemas P2P de Live Streaming

• Rafael Barra de Almeida UFJF
• Alex Borges Vieira UFJF
• Ana Paula Couto Silva UFJF

DOI: https://doi.org/10.5753/wtf.2012.23078

Abstract

P2P live streaming has become a popular method of transmitting live content. Due to its popularity, it may be the target of attacks and opportunistic users behavior. These attacks can lower transmission quality or even make users abandon the system. In this article, we address attacks in a P2P system. More precisely, we analyze a reputation system in a mesh based P2P system under a pollution attack. During the attack, malicious users collude and also change their identities (whitewashing) often trying to cheat the reputation system. We have tested the reputation system on PlanetLab, which confirms it efficiency during an attack without whitewashing. Ours results are twofold: first we show that just verifying package integrity is not an effective protection. In this case, peers have to ask again for the polluted data, generating a significant data transmission overhead. Second, a simple reputation mechanism is effective against pollution attack and peers collusion, but when malicious peers do whitewashing, the mechanism becomes ineffective. In this case, we note up to 180% of overhead due pollution and retransmission.

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