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One crucial point in the implementation of botnets is the command and control channel, which is used by botmasters to distribute commands to compromised machines and to obtain results from previous commands. While the first botnets were mainly controlled by central IRC servers, recent developments have shown the advantages of a more decentralized approach using Peer-To-Peer (P2P) networks. Interestingly, even though some botnets already use P2P networks, they do so in a naive fashion. As a result, most existing botnet implementations allow attackers to disrupt messages from the botmaster and to learn IP addresses of other nodes within the botnet.
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