Hail Caesar!


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


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}.



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