The 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 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.

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

/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.

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 utility uses Darwin's file magic to verify results from OutGuess key guessing.

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

The utility has been developed by Niels Provos.