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Re: [ietf-dkim] versions of RFC822 mail messages, Where is the formal definition of DKIM-Signature?

2018-02-10 12:13:50
On 02/10/2018 10:04 AM, Dave Crocker wrote:
On 2/10/2018 9:47 AM, John R Levine wrote:
Well, OK, other than DKIM-Improved-Signature how would you do conditional signatures, where the signature has to fail if the semantics of the re-sign tag aren't satisified? Remember that the current rule is that verifiers ignore tags they don't understand.

The current point of departure into DKIM is by the header field name. So I'm not sure why 'other than' is being queried, since it's the natural, existing point for going to a different protocol.

Different protocol? Yes. Current DKIM does not require support for unrecognized tags, beyond the initial set. You want to require support for additional tags. That's a fundamental change; so it isn't 'DKIM'. It's something different.

DKIM-Signature-v2: vs DKIM-Signature: v=2;

Angels, meet the pinhead.

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