glass-windows (359 solves / 311 points)

Description : I found a cool glass texture.

Given files : glass-windows.png

Write-up :

This one is quite straightforward, you're given aa transparent PNG image. The tools we've seen in pallets-of-gold can be used here too.

Here is the result when you XOR the image with StegSolve :

flag{this_is_why_i_use_premultiplied_alpha}

Original writeup (https://github.com/Khonsu-CTF/HSCTF-8/tree/main/misc/glass-windows).