We were given two images, both containing black and white noise.
Since it’s a crypto challege with low points, we guessed that it’s a simple XOR.

The quickest way to xor two images is with a command line one liner:

convert image1.png image2.png -fx "(((255*u)&(255*(1-v)))|((255*(1-u))&(255*v)))/255" flag.png

You'll get an output as flag.png image

It contains flag in base64 decode it to get the flag.