StegExpose is a steganalysis tool specialized in detecting LSB (least significant bit) steganography in lossless images such as PNG and BMP. It has a command line interface and is designed to analyse images in bulk while providing reporting capabilities and customization which is comprehensible for non forensic experts. StegExpose rating algorithm is derived from an intelligent and thoroughly tested combination of pre-existing pixel based staganalysis methods including:

  • Sample Pairs by Dumitrescu (2003)
  • RS Analysis by Fridrich (2001)
  • Chi Square Attack by Westfeld (2000)
  • Primary Sets by Dumitrescu (2002).

In addition to detecting the presence of steganography, StegExpose also features the quantitative steganalysis (determining the length of the hidden message). StegExpose is part of Benedikt Boehm's MSc (pdf) of a project at the School of Computing of the University of Kent, in Canterbury, UK.

It can be found on Github. Download StegExpose link: