From: "Jarkko Sakkinen" <jarkko@kernel.org>
To: "Ignat Korchagin" <ignat@cloudflare.com>
Cc: "James Bottomley" <James.Bottomley@hansenpartnership.com>,
"Mimi Zohar" <zohar@linux.ibm.com>,
"David Howells" <dhowells@redhat.com>,
"Paul Moore" <paul@paul-moore.com>,
"James Morris" <jmorris@namei.org>, <serge@hallyn.com>,
<linux-integrity@vger.kernel.org>, <keyrings@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <kernel-team@cloudflare.com>
Subject: Re: [RFC PATCH 0/2] TPM derived keys
Date: Tue, 14 May 2024 17:45:49 +0300 [thread overview]
Message-ID: <D19G5WTFSJ40.1D0KEUQO6Q8AT@kernel.org> (raw)
In-Reply-To: <CALrw=nE_sV=1DnCx1eM8Sgno-di0yCaWHX467ZEf1Fddwg7_rA@mail.gmail.com>
On Tue May 14, 2024 at 5:41 PM EEST, Ignat Korchagin wrote:
> On Tue, May 14, 2024 at 3:00 PM Jarkko Sakkinen <jarkko@kernel.org> wrote:
> >
> > On Tue May 14, 2024 at 4:11 PM EEST, Ignat Korchagin wrote:
> > > For example, a cheap NAS box with no internal storage (disks connected
> > > externally via USB). We want:
> > > * disks to be encrypted and decryptable only by this NAS box
> >
> > So how this differs from LUKS2 style, which also systemd supports where
> > the encryption key is anchored to PCR's? If I took hard drive out of my
> > Linux box, I could not decrypt it in another machine because of this.
>
> It differs with the fact that the disk has a clearly identifiable
> LUKS2 header, which tells an adversary that this is a disk with some
> data that is encrypted. With derived keys and plain dm-crypt mode
> there is no LUKS header, so it is not possible to tell if it is an
> encrypted disk or a disk with just random data. Additionally, if I
> accidentally wipe the sector with the LUKS2 header - all my data is
> lost (because the data encryption key from the header is lost). With
> derived keys I can always decrypt at least some data, if the disk is
> available.
I figured most of this out myself and sent a follow-up but yeah thnaks
for confirming my toughts. I get this part now.
Follow-ups to my follow-up...
BR, Jarkko
next prev parent reply other threads:[~2024-05-14 14:45 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-03 22:16 [RFC PATCH 0/2] TPM derived keys Ignat Korchagin
2024-05-03 22:16 ` [RFC PATCH 1/2] tpm: add some algorithm and constant definitions from the TPM spec Ignat Korchagin
2024-05-14 22:51 ` Jarkko Sakkinen
2024-05-14 22:52 ` Jarkko Sakkinen
2024-05-03 22:16 ` [RFC PATCH 2/2] KEYS: implement derived keys Ignat Korchagin
2024-05-14 23:10 ` Jarkko Sakkinen
2024-05-14 23:44 ` Jarkko Sakkinen
2024-05-15 0:00 ` Jarkko Sakkinen
2024-05-15 6:44 ` Ignat Korchagin
2024-05-15 12:00 ` Jarkko Sakkinen
2024-05-15 12:03 ` Jarkko Sakkinen
2024-05-15 7:26 ` Ignat Korchagin
2024-05-04 0:21 ` [RFC PATCH 0/2] TPM " Jarkko Sakkinen
2024-05-04 13:55 ` Ben Boeckel
2024-05-04 14:51 ` Jarkko Sakkinen
2024-05-04 15:35 ` Jarkko Sakkinen
2024-05-13 17:09 ` Ignat Korchagin
2024-05-13 22:33 ` James Bottomley
2024-05-14 9:50 ` Ignat Korchagin
2024-05-14 14:11 ` James Bottomley
2024-05-14 14:54 ` Ignat Korchagin
2024-05-13 17:11 ` Ignat Korchagin
2024-05-14 0:28 ` Jarkko Sakkinen
2024-05-14 10:05 ` Ignat Korchagin
2024-05-14 12:09 ` Jarkko Sakkinen
2024-05-14 13:11 ` Ignat Korchagin
2024-05-14 14:00 ` Jarkko Sakkinen
2024-05-14 14:30 ` Jarkko Sakkinen
2024-05-14 15:21 ` Jarkko Sakkinen
2024-05-14 15:26 ` Jarkko Sakkinen
2024-05-14 15:30 ` Ignat Korchagin
2024-05-14 15:42 ` Jarkko Sakkinen
2024-05-14 16:08 ` Ignat Korchagin
2024-05-14 16:22 ` Jarkko Sakkinen
2024-05-14 14:41 ` Ignat Korchagin
2024-05-14 14:45 ` Jarkko Sakkinen [this message]
2024-05-14 15:30 ` James Bottomley
2024-05-14 15:38 ` Ignat Korchagin
2024-05-14 15:54 ` James Bottomley
2024-05-14 16:01 ` Ignat Korchagin
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