JPEG Steganalysis Statistical Offset Tests 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

Statistical Offset Tests Specially cropping JPEG images can reveal telling information about embeddings through the resulting histograms.

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”)

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)