This book shares the lessons of the Honeynet Project, in which leading security professionals built networks designed to be compromised. From this they learned everything possible from the "blackhat" hackers who took the bait: their tools, their tactics, and their motives. The insights in this book will go a long way towards helping security professionals protect their networks against real attacks. If that's not enough, the book shows you how to build your own honeynet, learning even more about today's most significant exploits -- and tomorrow's. Lance Spitzer, leader of The Honeynet Project, begins by introducing honeynets and honeypots (the parts that make up the honeynet network), explaining how they work, and showing how to build one. Next, Know Your Enemy focuses on an in-depth analysis of attacks, including detailed analyses of compromised systems, and techniques for containing blackhat hackers while you gather evidence and work to identify them. Part III takes you into the minds of the blackhat hackers, focusing on the evidence left by actual attacks -- not theory or speculation. For all computer security specialists, and network and system administrators concerned with intrusion detection and security.