CTF: VolgaCTF VC task
name:
VC
category:
crypto
points:
50
Writeup
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 A.png B.png -fx "(((255*u)&(255*(1-v)))|((255*(1-u))&(255*v)))/255" C.png
That produced this result:
Flag: VolgaCTF{Classic_secret_sharing_scheme}