Security agencies are monitoring the emergence of a new type of Trojan Horse that uses peer-to-peer networks of bots to mount denial of service attacks on targeted sites. Dubbed Phatbot, one such Trojan is spreading widely across the Net and is especially difficult to disable due to the peer-to-peer nature of the attack. This type of technology is something that I predicted would emerge several years ago when I was thinking about cyberwarfare. If enough PC’s had such bots installed, they could literally take a government offline by focusing their combined outputs on a set of key nodes around the network. Similarly these networks could be used by protestors, or by terrorists, to bring business and communications to a halt. The problem is, the centralized architectures of our current networks are simply impossible to defend from distributed threats. We need to start developing truly decentralized server architectures that cannot be targeted and taken offline by attacks on any one location.