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+John the Ripper is a fast password cracker, currently available for many
+flavors of Unix (11 are officially supported, not counting different
+architectures), Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to
+detect weak Unix passwords. Besides several crypt(3) password hash types
+most commonly found on various Unix flavors, supported out of the box are
+Kerberos AFS and Windows NT/2000/XP/2003 LM hashes, plus several more with
+contributed patches.
+
+SlackBuild contain updated version of Ryan Lim's patch for john the
+ripper to support MPI. MPI allows you to use multiple processors on a
+single system, or a cluster of systems for cracking passwords using
+john the ripper. You need in this case OpenMPI, also available from
+the SlackBuilds.org repository. But the author of the program does not
+recommend use any hacks for parallel processing (see in the bottom of page
+http://www.openwall.com/lists/john-users/2005/08/24/4). Use it at own risk!
+
+Slackbuild contain also jambo patch. The jumbo patch enables processing
+of many password hash types and ciphers that are not supported by the
+official JtR. Both patches are disabled by default.
+
+Note this will not build in parallel, set MAKEFLAGS="-j1" if you have
+problems.
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