This is a public hosting of QR Scanner, my hardest challenge created for the 2020 NorthSec CTF
While no one managed to solve it during the CTF, a few teams did get very close. It is a 64-bit OCaml program statically compiled for Linux. Reversing OCaml programs is very different from reversing most other natively-compiled programming languages, so if you've never had the chance to crack an OCaml program before this is for you.
- Team Hubert Hackin': Part 1, Part 2
Did you write one that's not listed here? Create an issue and I'll include a link to it here.