			  unixcrypt-breaker

		    Break unix "crypt" encryption

				* * *

SUMMARY

 unixcrypt-breaker is an automated tool for breaking the encryption of
 the old unix crypt(1) utility.  It can guess substantial portions of
 the plaintext without previous knowledge of the key.

INSTALLATION

 For instructions on compiling and installation, see the file INSTALL.

USAGE EXAMPLE

 Suppose file.cpt is a file encrypted with crypt(1), and plain1,
 plain2, plain3 are large representative plaintext files of a similar
 type. First, sample the plaintext files using the command

  unixcrypt-breaker -s /tmp/stats.txt -c plain1 plain2 plain3

 This will write some statistical information about the plaintext
 files to the file /tmp/stats.txt.  Then, decrypt file.cpt with the
 following command:

  unixcrypt-breaker -s /tmp/stats.txt file.cpt

 The output is written to file.cpt.guess.

USAGE

 For detailed usage information, see the man page.

COPYRIGHT

 Copyright (C) 2006-2008 Peter Selinger

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or (at
 your option) any later version.

 This program is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of MER-
 CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
 USA. See also http://www.gnu.org/.

 The GNU General Public License is contained in the file COPYING that
 is distributed with this software.
