Capture the Flag (CTF) is a symmetric information warfare game. Each team is given a machine or a network of machines to defend, located on a network isolated from the Internet to prevent the game from causing any damage to production systems. Teams are scored on both their success in defending their assigned machine and on their success in attacking machines assigned to other teams. The goal is to give participants experience in securing a machine, as well as in conducting and reacting to real attacks using commonly available tools, in order to demonstrate the level of effectiveness of their chosen defensive strategies and tools.
Information on past CTF events includes competition rules, scorebot source code, and more.