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Date: Thu, 13 Oct 2022 20:02:17 +0200
From: Matthias Apitz <guru@...xarea.de>
To: john-users@...ts.openwall.com
Subject: Re: using john to decrypt DES hashes
El día jueves, octubre 13, 2022 a las 06:07:02p. m. +0200, Solar Designer escribió:
> On Thu, Oct 13, 2022 at 03:55:32PM +0200, Matthias Apitz wrote:
> > Do I understand you correct: I yescrypt all DES strings in the database
> > and when the user presents the PIN 4711 I first crypt the with DES and
> > the old salt 'xX' and the result with yescrypt and the stored "$y$...."
> > salt and when this match the user is authenticated, correct?
>
> That's correct.
>
> In your example, though, a 4-digit PIN is too weak even when you use
> yescrypt. You'll probably want to also introduce a password policy,
> such as by using our passwdqc.
Thanks. I didn't wanted to stress with all details. The PIN can be upto
40 bytes long (minimum is 11), is broken into pieces of 8 and DES encrypted
each part, resulting hashes are then concatenated with the salt only once
in front of the concatenation. This is some kind of standard procedure, I don't
remember it's name now.
matthias
--
Matthias Apitz, ✉ guru@...xarea.de, http://www.unixarea.de/ +49-176-38902045
Public GnuPG key: http://www.unixarea.de/key.pub
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