CTF

Setup # The challenge came with a Python-based ><> (Fish) interpreter and a one-line Fish program that checked the input against one huge constant.

ReezS # First wrong turn # My first read on this binary was completely wrong. It looked like a normal flag checker, so I did what I usually do for that kind of challenge: identify the comparison logic, lift the constants, and script the inverse.

This set had two Android reversing challenges. Both of them became much easier once I stopped staring at the default UI and followed the data that the APK already exposed.

These are cleaned-up contest notes rather than polished full writeups. Buzzing has a complete solve path, but Checker and Dutchman_app are intentionally kept as partial notes because the missing final artifacts are not preserved in this repo. I would rather leave those gaps visible than pretend I remember more than I actually do.