Capture the Flag 🚩

Capture the flag (CTF) is a competition where contestants earn points by finding secret messages ("flags") hidden in radio signals. Challenge yourself and improve your GNU Radio skills!

The GRCon 2024 CTF will take place from September 17-19, 2024. You can play in-person in Knoxville, or remotely over the internet.

To get started:

1. Read over the rules.
2. Join the GRCon24 Capture the Flag Matrix channel.
3. Register an account and log in.

---

Source code & writeups [Spoiler alert!]

Some challenge designers have published the source code of their challenges, and some players have posted writeups of their solutions. Email ctf@gnuradio.org if you'd like to have your writeup added to the list.

• Live walk-through session, recorded September 20, 2024
• Not-LoRa GRCon24 CTF challenge, by Daniel Estévez
• Source code for "Not-LoRa", by Daniel Estévez
• Source code for "Signal identification", "Nothing but noise", "On the broadcast bands", "On the ISM bands", and "Fox hunting", by Clayton Smith
• Source code for "Appalachia" and "Knoxville trivia", by Aerospace Team Platypus

---

Want more CTF?

Check out some of the past competitions, which are still playable:

• GRCon 2023 CTF
• GRCon 2022 CTF
• GRCon 2020 CTF ("deviations")