Fetch the Flag CTF 2022 writeup: Potty Training
Blog post from Snyk
A Snyk Ambassador recounts solving the “Potty Training” challenge from Snyk’s 2022 Fetch the Flag CTF, which provided only a PNG image named potty.png and required recognizing steganography as the likely technique for concealing information. After unsuccessfully inspecting the image as text, the solver used Python’s stegano package and its least-significant-bit extraction feature to reveal hidden Python code that requested content from a challenge website. The original HTTPS request produced a certificate error, but changing the URL to HTTP returned a page containing the challenge flag and a “Good puppy!” message. The write-up connects the exercise to the long history of steganography, highlights that both HTTP and message concealment remain relevant, and encourages readers to explore further CTF solutions and cryptography history.
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