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Researchers show that network coding can greatly improve the quality of service in P2P live streaming systems (e.g., IPTV). However, network coding is vulnerable to pollution attacks where malicious nodes inject into the network bogus data blocks that will be combined with other legitimate blocks at downstream nodes, leading to incapability of decoding the original blocks and degradation of network performance. In this paper, the authors propose a novel approach to limiting pollution attacks by identifying malicious nodes. In their scheme, the malicious nodes can be rapidly identified and isolated, so that the system can quickly recover from pollution attacks.
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