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Re: [COSE] COSE Support for AES-CTR and AES-CBC

Hannes Tschofenig <Hannes.Tschofenig@arm.com> Tue, 01 November 2022 10:29 UTC

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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
To: Sophie Schmieg <sschmieg=40google.com@dmarc.ietf.org>, Carsten Bormann <cabo@tzi.org>
CC: "Arciszewski, Scott" <scottarc@amazon.com>, "Zundel, Brent" <brent.zundel@avast.com>, "cose@ietf.org" <cose@ietf.org>
Thread-Topic: [COSE] COSE Support for AES-CTR and AES-CBC
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Archived-At: <https://mailarchive.ietf.org/arch/msg/cose/cThgwd_WzWCIoct-4ZV9Gs3TEUA>
Subject: Re: [COSE] COSE Support for AES-CTR and AES-CBC
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Carsten,

when you say “separating AEAD from unauthenticated encryption” are you referring to separating the storage of the tag from the encrypted ciphertext?

Ciao
Hannes

From: COSE <cose-bounces@ietf.org> On Behalf Of Sophie Schmieg
Sent: Monday, October 31, 2022 11:18 PM
To: Carsten Bormann <cabo@tzi.org>
Cc: Arciszewski, Scott <scottarc@amazon.com>; Zundel, Brent <brent.zundel@avast.com>; cose@ietf.org
Subject: Re: [COSE] COSE Support for AES-CTR and AES-CBC

Yes, I think that should be another way of fixing this issue.

On Mon, Oct 31, 2022 at 2:02 PM Carsten Bormann <cabo@tzi.org<mailto:cabo@tzi.org>> wrote:
On 27. Oct 2022, at 20:12, Sophie Schmieg <sschmieg=40google.com@dmarc.ietf.org<mailto:40google.com@dmarc.ietf.org>> wrote:
>
> In COSE, this weakness is currently mitigated due to the limited selection of algorithms and the strict separation of digital signatures and MACs.

So, would separating AEAD from unauthenticated encryption help?

Grüße, Carsten


--

Sophie Schmieg | Information Security Engineer | ISE Crypto | sschmieg@google.com<mailto:sschmieg@google.com>

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