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Re: [Dcrup] Adam Roach's No Objection on draft-ietf-dcrup-dkim-usage-04: (with COMMENT)

Kurt Andersen <kurta@drkurt.com> Thu, 19 October 2017 15:46 UTC

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From: Kurt Andersen <kurta@drkurt.com>
Date: Thu, 19 Oct 2017 08:46:27 -0700
Message-ID: <CABuGu1pXqRcWnH2heBHtYx3zKos=VA=hip39NS9GWZ0BFPXMkw@mail.gmail.com>
To: Scott Kitterman <sklist@kitterman.com>
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Subject: Re: [Dcrup] Adam Roach's No Objection on draft-ietf-dcrup-dkim-usage-04: (with COMMENT)
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On Thu, Oct 19, 2017 at 3:54 AM, Scott Kitterman <sklist@kitterman.com>
wrote:

>
> My assumption had been that since there's no valid signature with
> rsa-sha1, there's nothing to even consider putting in an A-R header field.
>
> I think the only result that can go in this case is None.  I hadn't
> thought we'd need to say that, but I guess maybe we do.
> <https://www.ietf.org/mailman/listinfo/dcrup>
>

I agree with Scott. The presence of a DKIM signature that is too weak to
trust (whether that is too short of a key or a non-supported hash
algorithm) equates to no DKIM signature at all.

--Kurt

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