A better understanding of Botnets will help to coordinate and develop new technologies to deal with serious security threat. Botnet Detection: Against the Biggest Security Threat, the volume contributed by world-class leaders in this field, based on 2006 ARO workshop on Botnets June. It provides botnet detection techniques and response strategies, as well as latest results from leading academic, industry and government researchers. Botnet Detection: Against the Biggest Security Threat intended for researchers and practitioners in the industry.