Stegdetect is an automated tool for detecting steganographic content
in images. It is capable of detecting several different
steganographic methods to embed hidden information in JPEG images.
Currently, the detectable schemes are:

    * jsteg
    * jphide (Unix and Windows)
    * invisible secrets
    * outguess 01.3b
    * F5
    * appendX and camouflage

WWW: http://www.outguess.org/detection.php