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]
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