**Full write-up (+files):** [https://www.sebven.com/ctf/2021/12/23/K3RN3LCTF2021-HADIOR.html](https://www.sebven.com/ctf/2021/12/23/K3RN3LCTF2021-HADIOR.html)
Cryptography – 499 pts (3 solves) – Chall author: Polymero (me)
“HADIOR will hold the DOOR.”
nc ctf.k3rn3l4rmy.com 2241
Files: hadior.py
This challenge was part of our very first CTF, K3RN3LCTF 2021.