Brasilia, DF, Brazil, pages 441-454, May 2013. [pdf]
Live streaming transmissions are becoming increasingly frequent in the Internet. One of the main challenges of those transmissions is to detect and prevent content pollution. This work presents a novel strategy to combat content pollution in P2P-based live streaming that is fully distributed. In order to prevent the propagation of polluted content, each peer independently compares and classifies its neighbors, and stops requesting chunks from those neighbors identified as polluters. The proposed solution was implemented using Fireflies, a scalable overlay network protocol. Experimental results evaluate the impact of the proposed strategy in terms of the network bandwidth overhead, and show that the strategy is an effective solution to combat content pollution in realistic scenarios of live streaming transmissions.
É notável o crescente uso da Internet para transmissões ao vivo. Por outro lado a poluição de conteúdo nas transmissões ao vivo em redes P2P continua sendo um desafio, já que soluções incorrem necessariamente em sobrecarga de processamento, de uso de rede, ou até atrasos na transmissão. Este trabalho apresenta uma nova estratégia distribuída e descentralizada com o objetivo de combater a propagação de conteúdo poluído em transmissões ao vivo. Para impedir a propagação da poluição, cada peer do sistema executa comparações periódicas sobre determinados chunks de seus vizinhos. Com base nos resultados das comparações, cada peer, de forma independente dos demais, deixa de solicitar chunks aos seus vizinhos considerados poluidores. A solução proposta foi implementada no Fireflies, um protocolo escalável para redes overlay. Resultados experimentais mostram que esta estratégia adiciona baixa sobrecarga no tráfego da rede, e é uma solução viável para tratar a poluição de conteúdo em transmissões ao vivo: em vários casos a solução foi capaz de eliminar a poluição no decorrer das transmissões.
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