Chapter 8 of 9 · Steganography 88%

📱 In 2022 the FBI warned that crooks were slapping fake QR stickers on public parking meters to steal card details. Could you read a tampered code before it reads you?

Your phone refuses to scan a damaged QR. Good. You don't need it. You'll read codes from a file with zbarimg, invert and repair a broken one in an editor, and follow a QR into base64 and a cipher. 🔍

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Steganalysis and detection

Soon Available Aug 03, 2026

Steganography

📱 In 2022 the FBI warned that crooks were slapping fake QR stickers on public parking meters to steal card details. Could you read a tampered code before it reads you?

Premium Chapter

Ready to track your progress?

Course Progress

Course Chapters

Steganography foundations

Metadata and EXIF secrets

Appended data and carving

LSB image steganography

Steghide and passphrase cracking

Audio steganography

Text and whitespace hiding

QR codes and visual encodings

Document and polyglot stego

Steganalysis and detection