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Date: Sat, 23 Dec 2006 19:20:27 +0100
From: websiteaccess <>
Subject: Re: Need Help with JTR's rules

On Sat, 23 Dec 2006 20:19:03 +0300, Solar Designer wrote:
> On Sat, Dec 23, 2006 at 03:35:25PM +0100, websiteaccess wrote:
>>  I would like a word of 4 charaters (for example : "wolf") become
>> "wwoollff"
> There's no convenient way to do that, so we have to resort to hacks like
> the following four rules:
> 	<2d
> 	>1<3f}
> 	>2<4f}fD3D3D3'6
> 	>3<5f}ffD3D3D3D3D3D5D5D6D6D6D6D6D6D6'8
> for lengths up to 4 (or for the resulting candidate passwords of lengths
> up to 8).
>>  I have tested (and many others)  "x11d Mx21d Mx31d Mx41d"
> This doesn't make sense.  The "x" command leaves only the extracted
> portion (in your case, one character in position 1), dropping the rest.
> Also, the "M" command only makes sense if ever followed by a "Q"; it is
> not intended and does not work for any other purpose.  Finally,
> character positions are numbered from 0, not 1.

 In my weird brain :
 xNM = extract substring from position N for up to M characters

wolf -> wwoollff

 x01d = extract letter '"w"olf' then w duplicated (duplicated with "d") 
= ww
 x11d = extract letter 'w"o"lf' then o duplicated (duplicated with "d") 
= oo
 x21d = extract letter 'wo"l"f' then l duplicated (duplicated with "d") 
= ll
 x31d = extract letter 'wol"f"' then f duplicated (duplicated with "d") 
= ff

 finally ww+oo+ll+ff = "wwoollff", but it wasn't the right thing to do.

Could you show us how works your example, with clear explaination like 
I do ?

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