[systemd-devel] [PATCH] cryptsetup: add keyfile-offset= support

[Lennart Poettering]

On Mon, 09.07.12 11:02, Matthew Monaco (dgbaley27 at 0x01b.net) wrote:

> On 07/09/2012 10:51 AM, Lennart Poettering wrote:
> > On Fri, 29.06.12 13:40, Tom Gundersen (teg at jklm.no) wrote:
> > 
> >> This is useful if your keyfile is a block device, and you want to
> >> use a specific part of it, such as an area between the MBR and the
> >> first partition.
> >>
> >> This feature is documented in the Arch wiki[0], and has been supported
> >> by the Arch initscripts, so would be nice to get this into systemd.
> > 
> > Hmm, I am not opposed to merge this, but before I do: I am a bit puzzled
> > what the usecase for this is -- why would you store the key like this?
> > Kinda defeats the purpose of encryption, no?
>
> It's no different than storing your key as a file (on a USB key) except there's
> a little added obfuscation. Also, it's simpler (imo); you don't have to wait for
> a FS to be mounted when unlocking your dm-crypt device.

Ah, so this is about storing the key on a different disk then the one to
decrypt. Didn't get that part, I see.

Lennart

-- 
Lennart Poettering - Red Hat, Inc.