Audio Steganography
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Index of audio steganography pages - spectrograms and MP3 analysis.
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Audio Steganography
Audio steganography hides data in sound files. The most common technique is spectrogram steganography — text or images hidden in the frequency-time representation of audio.
Pages in This Subsection
| Page | Difficulty |
|---|---|
| Spectrograms | Beginner |
| MP3 Steganography | Beginner |
Audio Steg Detection Workflow
Quick Approach
Run universal file checks
exiftool audio.wav # metadata check
strings audio.wav | grep flag # direct string
binwalk audio.wav # embedded filesTry steghide (WAV files)
steghide extract -sf audio.wav -p "" # blank password
steghide extract -sf audio.wav -p "password"Open in Audacity → view as Spectrogram
- Track dropdown → Spectrogram
- Window size: 2048 or 4096
- Look for text patterns in the high-frequency range
For MP3: check ID3 tags and mp3stego
exiftool audio.mp3 # ID3 tag check - look at Comment, TXXX
mp3stego -X audio.mp3 # mp3stego decodeDecode special encodings
multimon-ng -t wav -a DTMF audio.wav
# Morse code: listen at slow speed in Audacity
python3 -m sstv -d audio.wav -o output.pngTools by Format
exiftool audio.wav
steghide extract -sf audio.wav -p ""
steghide info audio.wav
binwalk -e audio.wav
# Audacity → Spectrogram → window 2048The spectrogram is the most common hiding place in beginner-level audio CTF challenges. Open Audacity first before running any other tools.
Common Encoding Types
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