Steganography

File Format
Name	Steganography
Ontology	Electronic File Formats Encryption Steganography

Steganography is a class of encryption in which the very fact that information exists is obscured. For example, an innocent-looking PNG image could contain a secret message encoded in its seemingly-random least-significant bits. Assuming the algorithm is sufficiently secure, it would be impossible to know whether the message exists or not, unless you know the secret key.

Formats

For a list of formats, see Encryption#Steganography.

Detection

• Aletheia - Detects F5, Steghide, LSB replacement, LSB matching and some kind of adaptive schemes
• Ben-4D Steganalysis Software - Detects JPHS (JPHide/JPSeek), LSB, Invisible Secrets v4.0, Fuse, Camouflage v1.2.1
• Stegdetect - Detects jsteg, JPHS (JPHide/JPSeek), invisible secrets, OutGuess 01.3b, F5 (header analysis), appendX and Camouflage
• StegSpy - Detects JPHS (JPHide/JPSeek), Hiderman, Masker, JPegX, Invisible Secrets
• Steganalysis papers by Hany Farid
  • Detecting Steganographic Messages in Digital Images - Jsteg, EZStego, OutGuess
    • Matlab source code
  • Detecting Hidden Messages Using Higher-Order Statistical Models - Jsteg, EZStego, OutGuess

Cracking

• Aletheia - dictionary attacks on steghide, OutGuess, OpenStego
• StegBreak (included with Stegdetect) - dictionary attacks against JSteg-Shell, JPHS (JPHide/JPSeek) and OutGuess 01.3b
• Stegseek - dictionary attacks against steghide
• StegCracker - dictionary attacks against steghide
• StegBrute - dictionary attacks against steghide

See also

• Data Hiding/Embedding
• Digital watermark

Links

• Wikipedia: Steganography
• Wikipedia: Deniable encryption