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Message-ID: <20060713130429.GA21044@openwall.com>
Date: Thu, 13 Jul 2006 17:04:29 +0400
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Filtering incremental attemps with known character
On Wed, Jul 12, 2006 at 10:41:36PM -0700, Andrew wrote:
> I'm trying to recover a lost password
Are you sure you need to do that? It might be quicker to reset the
password.
> in which I know I used a specific
> character. I don't know exactly where I placed the character in my
> password, but would like to speed up and incremental attempt at recovery
> by filtering out generated words which don't contain this character.
> I've been going through all of the external filter examples, but haven't
> been able to come up with a working filter that can handle this.
Here is a working example:
[List.External:WithA]
void filter()
{
int i, c;
i = 0;
while (c = word[i++])
if (c == 'a') return; // try it
word = 0; // skip it
}
> I've also seen a filter posted previously, which works great only when
> the position of the character is known.
You're probably referring to a filter() that actually inserts the known
character at the known position. This may be a reasonable thing to do
even when the position is not known. You'd have to run John multiple
times for different potential character positions, but the c/s rate may
be much higher since no processing time would be wasted on generating
candidate passwords that would get filtered out.
--
Alexander Peslyak <solar at openwall.com>
GPG key ID: B35D3598 fp: 6429 0D7E F130 C13E C929 6447 73C3 A290 B35D 3598
http://www.openwall.com - bringing security into open computing environments
Was I helpful? Please give your feedback here: http://rate.affero.net/solar
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