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Date: Sun, 5 Feb 2012 18:40:06 -0800
From: Corbin Simpson <>
Subject: Re: DES - not "traditional DES-based" - (VNC hash) with JtR

I've implemented this before; it's similar to the tripcode pattern. I'll
follow up later, when I'm not on the road. Solar would know better than me,
On Feb 5, 2012 4:22 PM, "A BC" <> wrote:

> Hi,
> I'm a new user of this mailing list, because I have a question I don't find
> an answer to : is there a way to use JtR against DES 'hashes', where :
> - you know the data to encrypt (challenge)
> - you know the data when encrypted (challenge response, server side)
> - you search the DES-password that was used to encrypt the data.
> It is a way to authenticate with VNC (
> page 14), which is reputed weak.
> So I search how easily it can be efficiently broken, but I am very
> surprised I did not find any answer to that. Maybe I searched wrongly, but
> all my searched are driven by the well known UNIX traditional DES-based
> salted hash.
> So, I wish to use JtR for its mangling rules, wordlists capabilities, (and
> maybe for its efficiency) but I can't find a way to make it do what I want.
> I have searched in the community resources (
> ),
> in the most useful mailing lists posts (
>, I have searched in
> the direction of "How to use the 'dynamic' format within john"
> (jtr179j5/doc/DYNAMIC.txt) but I did not found what I want "DES($s,$p)", I
> searched in tutorials (, and I
> tried to look at patches (,
> but no keywords matched, nor with our best friend ggl...
> I am thinking about how JtR implements its algorithms, but it seems very
> complicated.
> Otherwise, I am think about using JtR to generate the pwd to stdout, which
> I would pipe into a Python soft using PyCrypto, but I don't know if the
> pipes will react well to millions of pwds (will they stack ? will JtR wait
> for the stdout be emptied by the Python script ?).
> Is there something I missed ? Is there a solution better than another ? I
> can code in C under Win/Linux, Python, ...
> Thank you

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