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Message-ID: <20100222175925.GA23727@openwall.com>
Date: Mon, 22 Feb 2010 20:59:25 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: New updated lanman.chr based on RockYou Data
On Fri, Feb 19, 2010 at 11:27:35AM -0600, Minga Minga wrote:
> I decided to go ahead and make a replacement for lanman.chr based on the
> rockyou dataset.
Thank you!
> To give you an idea how it was created, I performed the following commands:
> 1) Taking the rockyou list - and converting to upper case.
> 2) cut -b 1-7 rockyou.dic >> lanmanrockyou.dic
> 3) cut -b 8-14 rockyou.dic >> lanmanrockyou.dic
> 4) cut -b 15-21 rockyou.dic >> lanmanrockyou.dic
> 5) generated LANMAN hashes for all entries in lanmanrockyou.dic
> 6) cracked all the LANMAN hashes
If/when you actually perform steps 5 and 6, then step 4 does not matter.
It may affect the time needed for steps 5 and 6, but it should not
affect the resulting .chr file.
However, if/when you omit steps 5 and 6 (and you mentioned that you
started doing that), then step 4 probably hurts, resulting in a .chr
file that is less optimal for actual LM hashes.
> 7) generated a .chr file from the cracked hashes.
Did you use "--external=Filter_LanMan" along with "--make-charset"?
With your steps 5 and 6 (and nothing else in john.pot) this shouldn't
make a difference, but if you omit steps 5 and 6 then using this filter
is a must.
To summarize, you have two approaches to choose from:
A. Perform steps 1, 2, 3, 5, 6, 7. (In fact, you could simplify/avoid
steps 1, 2, 3 - just LM-hash the RockYou list.)
-or-
B. Omit steps 5 and 6 from the above, but instead use Filter_LanMan.
Just to provide the context right here, the filter is:
[List.External:Filter_LanMan]
void filter()
{
int i, c;
word[7] = 0; // Truncate at 7 characters
i = 0; // Convert to uppercase
while (c = word[i]) {
if (c >= 'a' && c <= 'z') word[i] &= 0xDF;
i++;
}
}
Thanks again,
Alexander
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