Welcome to Capture the Flag (CTF). Every year, this annual competition draws thousands of teams from around the world.

Teams tackle problems in a series of real-world scenarios modeling various computer security problems. To succeed, teams must demonstrate a profound understanding of the roles and ramifications of cyber security in these situations.

Because the challenges are designed to teach, CTF requires contestants to integrate concepts, develop skills, and learn to hack as they go. Finalists compete on-site at one of four international CSAW locations, vying for the coveted top-three places.  

Registration now open

CSAW'17 Qualification Competition (online):

September 15 (20:00 UTC) - 17, 2017 (20:00 UTC)

CSAW'17 Final Competition (on-site):

November 9 - 11, 2017 at all participating international locations


Register for
Capture the Flag.



1st place team $1,000
2nd place team $750
3rd place team $500


Students and faculty leading CTF development.

Frequently asked questions.

Guidance and practice games to prep for CTF.

Meet the experts who contributed challenges.