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:
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| ➜ Downloads xxd kitters.jpg | cut -d ' ' -f 11 > kittens_text.txt
➜ Downloads xxd cattos.jpg | cut -d ' ' -f 11 > cattos_text.txt
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Since I wanted to do a per character diff I wrote the following Python script:
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| <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()
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And finally run the script:
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| ➜ Downloads python diff.py
Loaded lines 212919 212919
picoCTF{th3yr3_a5_d1ff3r3nt_4s_bu773r_4nd_j311y_*}%
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