PicoCTF 2019: whats-the-difference (Points 200)
Can you spot the difference? kitters cattos. They are also available at /problems/whats-the-difference… on the shell server In order to easily solve this challenge, I’ve used xxd and cut to generate an ascii hexdump of the images: 1 2 3 4 ➜ Downloads xxd kitters.jpg | cut -d ' ' -f 11 > kittens_text.txt ➜ Downloads xxd cattos.jpg | cut -d ' ' -f 11 > cattos_text.txt Since I wanted to do a per character diff I wrote the following Python script: 1 2 3 4 5 6 7 8 9 10 11 12 13 <pre class="wp-block-prismatic-blocks">```python def main(): new = open("cattos_text.txt") old = open("kittens_text.txt") old_file = old.readlines() new_file = new.readlines() print("Loaded lines", len(old_file), len(new_file)) for line in zip(old_file, new_file): for number, old_char in enumerate(line[0]): if old_char != line[1][number]: print(line[1][number], end="") main() And finally run the script: ...