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Capture The Flag 101 🚩

Welcome to CTF101, a site documenting the basics of playing Capture the Flags. This guide was written and maintained by the OSIRIS Lab at New York University in collaboration with CTFd.

In this handbook you'll learn the basics™ behind the methodologies and techniques needed to succeed in Capture the Flag competitions.

Ready? Let's go


Thank you to our incredible contributors. They work hard to keep this project open and available to everyone.

This project is open sourced under the MIT Open Source License. For more information, check out the MIT License page.


If you're interested in contributing to make this site great, please check out our Contributing section on Github!