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Date: Sun, 31 Jan 2016 13:48:10 -0500
From: japhar81 <japhar81@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: Cracking luks volume
Luks uses PBKDF2 which makes it very slow to crack.. That said, you can try
this;
1. run luks2john <file/disk> > luksdump to generate the file
2. create a john.pot that has your possible combinations, like this:
:F6TgW8D8F6TgW8D8F6TgW8D8!
:F6TgW8D8!F6TgW8D8#F6TgW8D8!#
:F6TgW8D8F6TgW8D8F6TgW8D8#!
:f6TgW8D8!f6TgW8D8f6TgW8D8#!
Note the : is important
3. Generate a chr file from that via: john --make-charset=custom.chr
4. Add a new mode in john.conf;
[Incremental:Custom]
File = $JOHN/custom.chr
MinLen = 27
MaxLen = 30
5. Run it with john --incremental=Custom luksdump
Again, this will probably take an absurdly long time unless you have a LOT
of horsepower behind it, and even then, not sure you'll get it.
I've been toying with a 340-core amazon cluster lately to crack a rar file
of mine, if you'd like me to take a swipe at yours, I can try throwing a
few hours of cluster time at it, just ping me off-list.
On Sun, Jan 31, 2016 at 11:34 AM, Daniel Sorry <santaftw123@...il.com>
wrote:
> Hello :)
>
> I was migrating my encrypted luks volume and decided to change password
> while I was at it...
> I'm sure I know the password but apparently I don't.
> I had this problem just after creating it, managed to get open it and was
> like ohh, was that combination and went to bed.
>
> Manually tried about 20 combinations but quickly realized I need it
> automated as I was writing combinations down by hand.
>
> Its a random 27-30 char password, no words, numbers, special chars etc.
>
> I'm a windows guy but managed to check that key 1 is enabled, so I only
> deleted the old key 0, should just be a matter of trying combinations based
> on what i know should be the password.
>
> Here's an example structure of how the password looks and various
> combinations it needs to try.
>
> I take an 8-9 char password like: F6TgW8D8 or F6TgW8D8!
> I thought i did it like: F6TgW8D8F6TgW8D8F6TgW8D8!
> Or perhaps F6TgW8D8!F6TgW8D8#F6TgW8D8!#
> Or F6TgW8D8F6TgW8D8F6TgW8D8#!
> Or f6TgW8D8!f6TgW8D8f6TgW8D8#!
>
> Maybe i was tired and entered a small char twice or something but it should
> only contain the chars I know it should have, i just cant for my life find
> the correct combination.
>
> What can be done here ?
> I'm i fucked ?
>
> I have no coding skills and limited scripting skills (Pretty much edit
> stuff)
>
> It's a persistent tails volume, if that matters. :)
>
> I'm pretty techincal on the windows side and I learn fast on linux!
> I dont mind paying/donate to get it open :)
>
> Thanks!
>
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