Photos: Hacking at Defcon

Teams compete in Defcon's Capture the Flag game, organized by a group called Kenshoto. In this computer security war game, the goal is to attack rivals' networks while simultaneously defending one's own.

To participate, would-be entrants must score well in a prequalifying round by answering questions ranging from hacker trivia to computer forensics and Web server administration.

Declan McCullagh/CNET

By Bill Detwiler

Bill Detwiler is Editor in Chief of TechRepublic and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the ...