IrisCTF 2025


CTF Archive.

IrisCTF 2025

IrisCTF is a 48-hour Capture the Flag competition organized by IrisSec. IrisCTF takes place the first full weekend of every year online, and features challenges in the disciplines of reverse engineering, binary exploitation, web exploitation, cryptography, radio frequency, networks, forensics, open-source intelligence, and more. IrisCTF is meant to be, above all else, a fun, lighthearted, and educational experience for all.

IrisCTF 2025 starts at 2025-01-04 (Jan 4, 2025) @ 00:00 UTC and ends at 2025-01-06 (Jan 6, 2025) @ 00:00 UTC. Registration is open at https://2025.irisc.tf.

Infra sponsored by goo.gle/ctfsponsorship.

Organisers: IrisSec

Original Date: Sat, 04 Jan. 2025, 00:00 UTC — Mon, 06 Jan. 2025, 00:00 UTC
Original URL: https://2025.irisc.tf/
CTFtime Entry: IrisCTF 2025
Organizing Team: IrisSec


Challenges

Author: lambda

Something is a bit off with my AES implementation. Get it? AES implementation is directly from here.

Author: sera

CHALLENGE'S DISCLAIMER: Please do not include any accent markings or special characters into the flag. Apply proper capitalization to the flag.

We took our annual road trip to Baja California Sur to visit the beach and play some golf. I like how this location is farther from the city compared to other resorts. I really enjoyed the sweet and savory sauce on the pizza with shredded chicken. After eating, I fell asleep, and half of my legs ended up getting tanned. https://osint-food-blog-web.chal.irisc.tf/

Question: Which hotel did Adam stay at?

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: Lychi

Welcome to this year's RF category! Here's the usual legal disclaimer yada yada:

We are not lawyers. We're not your lawyers. This isn't legal advice.

When playing with radios, never transmit unless you know what you're doing. Always check your local laws and legislations before you transmit. In the United States, unauthorized transmission outside of certain frequency bands is illegal and can even be considered a felony offense in some cases. Radio frequency is cool, but don't get in trouble!

You do not need to transmit for any of these challenges. You do not need any radio hardware for any of these challenges. All of these challenges were made to be solved without the need for real-life hardware.

This disclaimer isn't meant to deter. It's meant to educate and communicate that you should educate yourself on the specific legalities for your locality if you want to dive into the world of RF. Once again, this is not legal advice, and you do not need to transmit for any of these challenges.

Now that we've gotten that out of the way, let's start with a simple challenge to prove some basic competency before we get into the more advanced stuff. This challenge will unlock the rest of the RF category.

I picked up this transmission, but it's way too noisy to make any sense of it. Can you give it a shot?

Flag format: irisctf{th3_m3ss4ge} in all lowercase. Replace spaces with underscores. Add curly braces.

Author: skat


30-Day Scoreboard:

This scoreboard reflects solves for challenges in this module after the module launched in this dojo.

7-Day | 30-Day | All-Time

Rank Hacker Badges Score