From: Arno Wagner <arno@wagner.name>
To: dm-crypt@saout.de
Subject: Re: [dm-crypt] cryptesetup remove question
Date: Mon, 29 Mar 2010 23:41:52 +0200 [thread overview]
Message-ID: <20100329214152.GA20026@tansi.org> (raw)
In-Reply-To: <8a87818a1003291321m7dab4418pa046f6667245a79a@mail.gmail.com>
Without checking: The salt?
Arno
On Mon, Mar 29, 2010 at 04:21:41PM -0400, Jamaal Speights wrote:
> Thanks.
>
> When I do dmsetup table [name] --showkey
>
> I see aes-cbc-plain. Then 64 characters. I see the first 40 are the
> *RIPEMD-160
> Hash* of my password. What are the last 24 characters?
>
> ripemd160_passphrase + ??????
>
> thanks
>
> -j
>
>
> On Fri, Mar 26, 2010 at 4:58 AM, Milan Broz <mbroz@redhat.com> wrote:
>
> > On 03/26/2010 12:38 AM, Jamaal Speights wrote:
> > > I am curious about the cryptsetup remove function and its purpose after
> > > rebooting a system. Is my system still vulnerable to someone else
> > > mounting my encrypted file if I don't remove the mapping before I
> > > reboot? When my system comes back up I don't see the mapping in
> > > /dev/mapping/cryptfile . Also if I do cryptsetup to mount the image
> > > again I have to re-enter the password. So whats the point of using
> > > cryptsetup remove when shutting your system down?
> >
> > Remove key from memory? (google coldboot attack)
> >
> > Deactivate crypt mapping so underlying storage can safely deactivate
> > devices (LVM for example)?
> >
> > Umount underlying filesystem if mappping is to file on it?
> >
> > ...
> >
> > Milan
> >
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> dm-crypt@saout.de
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--
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name
GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F
----
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If it's in the news, don't worry about it. The very definition of
"news" is "something that hardly ever happens." -- Bruce Schneier
next prev parent reply other threads:[~2010-03-29 21:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-25 23:38 [dm-crypt] cryptesetup remove question Jamaal Speights
2010-03-26 8:58 ` Milan Broz
2010-03-29 20:21 ` Jamaal Speights
2010-03-29 21:41 ` Arno Wagner [this message]
2010-03-29 22:59 ` Milan Broz
2010-03-30 18:52 ` [dm-crypt] device-mapper: remove ioctl failed: Device or resource busy Ali Reza Sajedi
2010-03-30 19:43 ` Milan Broz
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