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Re: [Rats] Review of draft-birkholz-rats-daa

Hannes Tschofenig <Hannes.Tschofenig@arm.com> Mon, 07 June 2021 07:07 UTC

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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
To: Christopher Newton <c.newton@surrey.ac.uk>, "draft-birkholz-rats-daa@ietf.org" <draft-birkholz-rats-daa@ietf.org>
CC: "rats@ietf.org" <rats@ietf.org>, Thomas Fossati <Thomas.Fossati@arm.com>, Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, Liqun Chen <liqun.chen@surrey.ac.uk>
Thread-Topic: Review of draft-birkholz-rats-daa
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Date: Mon, 07 Jun 2021 07:07:27 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/MZIaV471_phJSREwCAG0fpYGKTI>
Subject: Re: [Rats] Review of draft-birkholz-rats-daa
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Hi Christopher,

I think it would be worthwhile to note in the security considerations section that you are making certain assumptions about the content of the token. It is easy to imagine that those using the token get this wrong.
There is also good privacy terminology you can rely on, see https://datatracker.ietf.org/doc/html/rfc6973

Ciao
Hannes



-----Original Message-----
From: Christopher Newton <c.newton@surrey.ac.uk>
Sent: Sunday, June 6, 2021 10:20 PM
To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>; draft-birkholz-rats-daa@ietf.org
Cc: rats@ietf.org; Thomas Fossati <Thomas.Fossati@arm.com>; Henk Birkholz <henk.birkholz@sit.fraunhofer.de>; Liqun Chen <liqun.chen@surrey.ac.uk>; Christopher Newton <c.newton@surrey.ac.uk>
Subject: RE: Review of draft-birkholz-rats-daa

Hi Hannes,

Thank you for your interest and comments.

> In any case, [DAA] has to be a normative reference.
Yes.

> I would also like to see the privacy properties articulated in more detail, particularly when DAA is used with an attestation token that potentially contains a lot of claims.

For DAA itself, we assume that the attestation token does not reveal the identity of the signer. However, if this is the case there is research into property based attestation that will anonymise the attestation token.

Regards,

Liqun and Chris.

--
Dr Christopher Newton
Surrey Centre for Cyber Security
Department of Computer Science
University of Surrey
Guildford, Surrey, GU2 7XH, UK
--

-----Original Message-----
From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
Sent: 26 May 2021 14:59
To: draft-birkholz-rats-daa@ietf.org
Cc: rats@ietf.org; Thomas Fossati <Thomas.Fossati@arm.com>
Subject: RE: Review of draft-birkholz-rats-daa

Hi Henk,

I have not been following the RATS work closely and hence I was wondering whether this document is supposed to become part of the architecture document?
In any case, [DAA] has to be a normative reference. I would also like to see the privacy properties articulated in more detail, particularly when DAA is used with an attestation token that potentially contains a lot of claims
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