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Re: [dmarc-ietf] ARC questions

Brandon Long <blong@google.com> Mon, 23 November 2020 20:01 UTC

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References: <dcc265f9-a143-5093-eba0-94ee059c7cc7@mtcc.com> <20201122021417.B5E6E27B3E59@ary.qy> <CABuGu1pX=5ZC4RLsv19qrosRN9nCrPdeSk5Xg4O7ViEZit6dnA@mail.gmail.com> <453c4db4-fc62-dc76-5b15-707623d66f9f@mtcc.com> <64f18b-ae8-8c15-3d33-ff2d864c35bc@taugh.com> <884541e6-5076-7f8f-d1d2-d68ea9c5a2bc@mtcc.com> <8fa2d88c-55df-aa8e-932f-8f7bc97d741@taugh.com> <77854271-296a-b4f6-202e-c085036289d4@mtcc.com> <feac41f-6144-2e21-c3fa-2b7770bfeefc@taugh.com> <CABa8R6vCrBmU5medOuf1QfpktCDt4jVa935rFBjFGpGPXX1FcA@mail.gmail.com> <0102f3db-7bb8-9434-354d-460cf4cf4fc4@mtcc.com>
In-Reply-To: <0102f3db-7bb8-9434-354d-460cf4cf4fc4@mtcc.com>
From: Brandon Long <blong@google.com>
Date: Mon, 23 Nov 2020 12:01:11 -0800
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To: Michael Thomas <mike@mtcc.com>
Cc: John R Levine <johnl@taugh.com>, "dmarc@ietf.org" <dmarc@ietf.org>
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Subject: Re: [dmarc-ietf] ARC questions
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On Mon, Nov 23, 2020 at 11:58 AM Michael Thomas <mike@mtcc.com> wrote:

>
> On 11/23/20 11:34 AM, Brandon Long wrote:
>
>
> From the other direction, one could say that ARC is a superset of A-R and
> DKIM with
> different purpose, and you might be able to subsume them into ARC, but you
> couldn't
> build ARC out of the originals.
>
>
> It's seems to me that the superset involves explicitly binding an auth-res
> to a dkim-like signature. Is there more beyond that?
>
Right, explicitly binding auth-res to a dkim-like signature that survives
through multiple hops.

The dkim signature acts like an AMS i=0, and the auth-res is like the AAR
max(i)

Brandon

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