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

• Stegdetect - Detects jsteg, JPHS (JPHide/JPSeek), invisible secrets, outguess 01.3b, F5 (header analysis), appendX and camouflage
• 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
• Ben-4D Steganalysis Software - Detects JPHS (JPHide/JPSeek), LSB, Invisible Secrets v4.0, Fuse, Camouflage v1.2.1

Links

• Wikipedia: Steganography
• Wikipedia: Deniable encryption