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Date: Sat, 21 Dec 2013 21:54:02 +0400
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: searching the first char's of a very long password

On Sat, Dec 21, 2013 at 12:57:45PM +0000, wyss-adrian@...onet.ch wrote:
> 	i am using a password with 20 char.
> the password looks like
> 
> 	f%w

Here are some relevant examples:

http://www.openwall.com/lists/john-users/2008/05/20/2
http://www.openwall.com/lists/john-users/2008/03/31/1

both are linked from:

http://openwall.info/wiki/john/mailing-list-excerpts

I think you should use a combination of incremental and external modes,
or a one-entry wordlist (with your known portion of password) and a
custom one-line ruleset (using the rule preprocessor).  The latter
approach may require less typing, but is only usable for very short
unknown portions (you mentioned off-list that you only wanted to crack 5
unknown characters, so it may work).

In bleeding-jumbo, there's also mask mode (which would let you specify
everything you need on the command-line, without editing the .conf
file), but you said you can't compile anything from source, so that's
not an option for you currently.  Luckily, there are several other
options (above).

Alexander

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