backdoorctf 2017 - ecb Writeup

by rop2bash
September 24, 2017

We know that images encypted with an ECB algorithm leave some traces or pattern of the original image ex..

img1

img2

Well those don’t resemble ECB encrypted images, but we are pure hearted and innocent so we decide to believe in the challenge name and description and start playing around with the images in GIMP and Stegosolve.

After some time we start seing something:

img1

img2

By overlapping the images and tracing over the lines we can more or less read the flag.