JPEG Steganalysis

1
JPEG Steganalysis
The structure and widespread use of the JPEG
format provide an easy channel to secretly
communicate information. Our steganalysis aims
to detect the presence and nature of hidden data
in JPEG image files.

• Statistical Offset Tests
• Spatial Domain Compatibility Tests

2
Statistical Offset Tests

• Specially cropping JPEG images can reveal
  telling information about embeddings through the
  resulting histograms.

3
Spatial Domain Compatibility Tests

• Most steganographic embedding algorithms
  ignore the fact that their output may not be
  possible via normal use of the JPEG standard.

(This image contains a text file that reads
hello world)
4
JPEG Steganography

• Probabilistic Steganographic embedding
• Aims to maximize payload while minimizing
  detectability
• Not detectable using JPEG-compatibility
  steganalysis

• Image above embedded using J2 (data set is a
  small C program)