CTF Qual 2008 Tutorials
Forensics 500
Task: Find the hidden message in the image below:
Hint 1: The transparent part of the image contains a
lot of random-looking colors.
Hint 2: To see them, open the image in Paint.
Hint 3: Get the Red, Green, Blue values of the pixels
and analyze the numbers. They are not random.
Hint 4: A lot of the pixels have the same value of one color--focus on them.
Hint 5: Take those pixels and find the other color that has values from 1 to 26.
Hint 6: Translate the numbers 1 to 26 to letters A-Z
Hint 7: Apply a Caesar Cipher to the letters, moving them forward in the alphabet.
Links
Capture the Flag Solutions