DragonFly On-Line Manual Pages

STEGBREAK(1)           DragonFly General Commands Manual          STEGBREAK(1)

NAME
     stegbreak - launches brute-force dictionary attacks on JPG image

SYNOPSIS
     stegdetect [-qV] [-r rules] [-f wordlist] [-t tests] [-c] [file ...]

DESCRIPTION
     The stegbreak states a brute-force dictionary attack against the
     specified JPG images.

     The options are as follows:

     -q           Only reports images for which the dictionary attack
                  succeeded.

     -V           Displays the version number of the software.

     -r rules     Contains rules with transformations that will be applied to
                  the words in the wordlist.  The rules follow the same syntax
                  as in Solar Designers password cracking program John the
                  Ripper.  The default is rules.ini.

     -f wordlist  Specifies the file that contains the words for the
                  dictionary attack.  The default is /usr/share/dict/words.

     -t tests     Sets the tests that are being run on the image.  The
                  following characters are understood:

                  o           The dictionary attack follows the embedding used
                              by outguess.

                  p           The dictionary attack follows the embedding used
                              by jphide.

                  j           The dictionary attack follows the embedding used
                              by jsteg-shell.

                  The default value is p.

     -c           Specifies that the JPG images should be converted to a small
                  sized object that contains all the information necessary for
                  the dictionary attack.  This can be used to reduce the size
                  of the data set in distributed computing applications.

     The stegbreak prints the filename, the embedding system and the password
     when the attack succeeded for an image.  For jsteg-shell and outguess, it
     also prints analysis results from the built in file utility.

     Pressing Ctrl-C causes a status line to be displayed, pressing Ctrl-C a
     second time within one second aborts the program.

EXAMPLES
     stegbreak -t p auto.jpg

     Launches a brute-force dictionary attack against auto.jpg assuming that
     information has been embedded with jphide.

FILES
     /usr/share/dict/words                 default wordfile for the dictionary
                                           attack.
     /usr/local/share/stegbreak/rules.ini  rules on how to manipulate words
                                           for the dictionary attack, from
                                           John the Ripper.

SEE ALSO
     stegdetect(1)

ACKNOWLEDGEMENTS
     This program contains source code from Solar Designer's John the Ripper.
     It has been placed under a BSD-license with his permission.

     This product includes software developed by Ian F. Darwin and others.
     The stegbreak utility uses Darwin's file magic to verify results from
     OutGuess key guessing.

     Korejwa provided information on the data format used by JSteg Shell.

AUTHORS
     The stegbreak utility has been developed by Niels Provos.

DragonFly 6.5-DEVELOPMENT        July 5, 2001        DragonFly 6.5-DEVELOPMENT