Agent skill · security · yaklang
steganography-techniques
Steganography detection and extraction playbook. Use when analyzing images (LSB, PNG chunks, JPEG DCT, EXIF), audio (spectrogram, DTMF), files (polyglots, appended data, ADS), and text (whitespace, zero-width, homoglyphs) for hidden data.
Why this skill is useful
Adds executable scripts and detailed workflows for detecting and extracting hidden data across various file types that are not commonly known.
What it needs
Requires apngdis, exiftool, java, jpegdump, jsteg, pngcheck, python3, stegcracker, steghide, stegoveritas, stegsolve, zsteg installed locally. About 6k tokens when loaded. Last updated 2026-06-16. 1,563 stars on the source repository.
What this skill does
SKILL: Steganography Techniques — Expert Analysis Playbook AI LOAD INSTRUCTION: Expert steganography detection and extraction techniques. Covers image steganography (LSB, PNG chunk hiding, JPEG DCT, EXIF metadata, dimension tricks, palette manipulation), audio steganography (spectrogram, LSB, DTMF, morse), file steganography (polyglots, binwalk, NTFS ADS, steghide), and text steganography (whitespace, zero-width Unicode, homoglyphs). Base models miss the systematic file-type-based analysis approach and tool-specific extraction workflows. 0. RELATED ROUTING Before going deep, consider loading: traffic-analysis-pcap for extracting files from network captures before stego analysis memory-forensics-volatility for extracting files from memory dumps classical-cipher-analysis if extracted hidden data is further encrypted/encoded Tool Reference Also load STEGOTOOLSGUIDE.md when you need: Tool installation instructions and dependencies Detailed command reference for each stego tool Workflow patterns for specific file types --- 1. IMAGE STEGANOGRAPHY LSB (Least Significant Bit) LSB embeds data in the least significant bits of pixel color channels. PNG Specific JPEG Specific EXIF Metadata Palette-Based (GIF) --- 2. AUDIO STEGANOGRAPHY Spectrogram Analysis Audio LSB DTMF / Morse Code WAV Header Manipulation --- 3. FILE STEGANOGRAPHY Polyglot Files A single file that is valid in two or more formats simultaneously. Appended / Embedded Data NTFS Alternate Data Streams (ADS) Steghide Brute Force --- 4. TEXT STEGANOGRAPHY Whitespace Encoding Zero-Width Characters Homoglyph Substitution --- 5. DECISION TREE
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills yaklang/steganography-techniques