Peer-to-Peer(P2P) botnets that use P2P networks for remote control of bots have become the root cause of many Internet attacks. Compared with current botnets, P2P botnets are harder to be hijacked and defended. In this paper, we presents two sybil attacks techniques, i.e., random sybil attack and d-choice sybil attack to mitigate P2P botnets based on analyzing the weakness of botnets. We quantitatively study how the size of sybil nodes can attack the P2P botnet effectively. The performances of our schemes have been evaluated by both theoretical analysis and simulation.
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