Steganography Techniques

This is your systematic playbook for finding hidden data in files. It walks through LSB extraction in images with zsteg and StegSolve, JPEG steganography via steghide and jsteg, audio spectrogram analysis for visual patterns, DTMF decoding, polyglot file detection with binwalk, and text steganography using whitespace or zero-width Unicode. The structure is file-type-first, which matters because you need different tools and workflows for PNG chunks versus JPEG DCT coefficients versus WAV appended data. It includes the CRC dimension mismatch trick for PNG and concrete extraction commands. If you're doing CTF forensics or security analysis where you suspect hidden payloads, this gives you the methodical checklist base models typically fumble through trial and error.