2022-06-03 11-32-03~2.png 🎁 Top

After repairing the height or running StegSolve on the "Gray Bits" or "Red 0" planes, a text string (the flag) typically appears at the bottom of the image or in a separate output window. It usually follows the format CTF{...} or FLAG{...} .

: Locate the IHDR section (usually starts at offset 0x0C ). The four bytes following IHDR are the width, and the four after that are the height. 2022-06-03 11-32-03~2.png

: Use the file command in Linux to confirm it is indeed a PNG image. After repairing the height or running StegSolve on

: Run strings 2022-06-03 11-32-03~2.png . In many versions of this challenge, the flag or a hint is appended to the end of the file in plain text, past the IEND chunk. past the IEND chunk.