Hail Caesar!

Challenge:

This image was found in Ghost Town along with the encoded message below. See if you can decipher the message. Enter the entire decoded message as the flag.

Decode this: TGG KUSJWV QGM

Solution:

The challenge description along with the coin in the provided image are clear hints that a rotation cipher is needed to decipher the message, e.g Caesar Cipher, ROT-13, etc. My first guess was that ROT-18 was used due to the coin in the picture showing the letters A and S aligned, but that didn’t produce readable plaintext. I then used CyberChef’s ROT-13 operation to manually cycle through the shifts until landing on ROT-8, which produced the deciphered text.


The completed flag is, flag{BOO SCARED YOU}.

Published:

Updated:

Leave a comment