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From: Milan Broz <gmazyland@gmail.com>
To: dm-crypt <dm-crypt@saout.de>
Subject: [dm-crypt] LUKS & search for passphrase using dictionary
Date: Fri, 20 Jul 2012 00:48:17 +0200	[thread overview]
Message-ID: <50088EB1.4090403@gmail.com> (raw)

Hi,

From time to time someone tries to recover (or crack) LUKS passphrase
using dictionary lists.
I saw lately even some crazy patches for cryptsetup doing that.

Please do not patch source or create some slow bash scripts
(initialization and memory locking cost resources).
Just use libcryptsetup. I added some example how to do it, see

http://code.google.com/p/cryptsetup/source/browse/#git%2Fmisc%2Fdict_search

e.g. for JTR known password list you can run (on quadcore cpu here)
  # luks_dict test.img /usr/share/john/password.lst 4

Then read FAQ how LUKS keyslot iterations slow down these attacks...

It is just quickly written example, perhaps with some bugs.

Anyway, enjoy :)
Milan

p.s.
If you really run this, compile cryptsetup with openssl support
(configure --with-crypto_backend=openssl) it is quicker than default gcrypt. 

             reply	other threads:[~2012-07-19 22:48 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-19 22:48 Milan Broz [this message]
2012-07-19 23:34 ` [dm-crypt] LUKS & search for passphrase using dictionary Arno Wagner

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