Steganography

LSB image steganography

Chapter 4 of 6 · Steganography 66%

🛒 Around 2019, Magecart crews hid stolen credit-card-stealing code inside ordinary product images on real shops, so scanners saw a picture, not a skimmer. Could you find the payload in the pixels?

Flipping the lowest bit of a pixel shifts its color by one shade out of 256, invisible, yet enough to carry a message. You'll run zsteg to brute-force every bit-order and channel on a PNG, then extract the payload byte for byte. 🔬

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7
Text and whitespace hiding
Soon Available Jul 31, 2026
8
QR codes and visual encodings
Soon Available Aug 01, 2026
9
Document and polyglot stego
Soon Available Aug 02, 2026
10
Steganalysis and detection
Soon Available Aug 03, 2026
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