From: Milan Broz <mbroz@redhat.com>
To: Bai Shuwei <baishuwei@gmail.com>
Cc: linux-crypto@vger.kernel.org
Subject: Re: how the key is generated?
Date: Wed, 27 Jan 2010 09:21:01 +0100 [thread overview]
Message-ID: <4B5FF76D.3080406@redhat.com> (raw)
In-Reply-To: <f3566d61001261921v2a7f319bgddb3a3bc971eea10@mail.gmail.com>
On 01/27/2010 04:21 AM, Bai Shuwei wrote:
> On Tue, Jan 26, 2010 at 4:58 PM, Milan Broz <mbroz@redhat.com> wrote:
> I use "dmsetup table --showkeys" get the bellow information.
>
> disk$ sudo dmsetup table --showkeys /dev/mapper/dsi0
> 0 2040 crypt aes-xts-plain
> 3131313131313131313131313131313131313131313131313131313131313131 0 7:0
> 2056
>
> If i forget the passphase, can i use the above information/key to
> recovery my disk?
yes, if you know mapping table (iow: key, cipher and mode,
IV and device offset), you can map this device directly using dmsetup.
(try dmsetup create dsi0 --table "0 2040 crypt .... 7:0 2056")
Anyway, you can better backup LUKS header and use some other passphrase,
there is also volume_key project, which implements key escrow (for cryptsetup too).
Milan
prev parent reply other threads:[~2010-01-27 8:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-26 8:41 how the key is generated? Bai Shuwei
2010-01-26 8:58 ` Milan Broz
2010-01-27 3:21 ` Bai Shuwei
2010-01-27 8:21 ` Milan Broz [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B5FF76D.3080406@redhat.com \
--to=mbroz@redhat.com \
--cc=baishuwei@gmail.com \
--cc=linux-crypto@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.