tl;dr: reversing an app made from python (kivy + renpy), decode resources to extract flag. full writeup [here](https://blackbeard666.github.io/pwn_exhibit/content/2020_CTF/DefCampCTF/modernlogin_writeup.html)(https://blackbeard666.github.io/pwn_exhibit/content/2020_CTF/DefCampCTF/modernlogin_writeup.html)