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Date: Thu, 21 May 2015 14:30:11 -0400
From: Rich Rumble <richrumble@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: Recovering truecrypt pass-phrase with known keyfile
On Thu, May 21, 2015 at 1:36 PM, magnum <john.magnum@...hmail.com> wrote:
> On 2015-05-21 19:27, Dhiru Kholia wrote:
>>
>> On Thu, May 21, 2015 at 5:28 PM, Marek Wrzosek <marek.wrzosek@...il.com>
>> wrote:
>>>
>>> Lately I've been reading TrueCrypt User Guide and I'm curious. Is it
>>> possible to recover pass-phrase of truecrypt volume with known keyfile
>>> using JtR? If not, are there any plans of adding this to john in the
>>> future?
>>
>>
>> Seems to be simple enough,
>>
>> https://github.com/bwalex/tc-play/blob/master/crypto.c#L201
>
>
> I see nothing there. Isn't that part of the code using already decrypted
> keyfile data?
If I recall from TC's doc's it read the first 1024 bytes of the
keyfile and used that as the second part of the password.
<quote>
Any kind of file (for example, .txt, .exe, mp3, .avi) may be used as a
TrueCrypt keyfile. However,
we recommend that you prefer compressed files, such as .mp3, .jpg,
.zip, etc. Note that TrueCrypt
never modifies the keyfile contents. Therefore, it is possible to use,
for example, five files in your
large mp3 collection as TrueCrypt keyfiles (and inspection of the
files will not reveal that they are
used as keyfiles).
WARNING: If you lose a keyfile or if any bit of the first 1024
kilobytes of the keyfile is corrupted, it
will not be possible to mount any volume that uses the keyfile!
</quote>
I'll find my old versions and get some samples over to the wiki later
tonight if no one else does :) You can/could use key-files and no
password too.
-rich
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