Introduction

To add some context, first let’s recall that the 404CTF is a big CTF in France. The 2025 edition was attended by almost 3000 active players, with more than 80 challenges and during 3 entire weeks.

Being the only chall makers really interested by making hardware this year, I did the whole category for this edition. I tried my best to be exaustive in the challenge’s topics, this includes topics such as radio-frequencies, electronics,