Re: [DNSOP] [Ext] review: draft-wessels-dns-zone-digest-04.txt

Paul Hoffman <paul.hoffman@icann.org> Thu, 01 November 2018 15:27 UTC

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From: Paul Hoffman <paul.hoffman@icann.org>
To: dnsop WG <dnsop@ietf.org>
Thread-Topic: [Ext] [DNSOP] review: draft-wessels-dns-zone-digest-04.txt
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Date: Thu, 1 Nov 2018 15:27:20 +0000
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Subject: Re: [DNSOP] [Ext] review: draft-wessels-dns-zone-digest-04.txt
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On Nov 1, 2018, at 8:18 AM, A. Schulze <sca@andreasschulze.de>; wrote:
> 
> 
> 
> Am 01.11.18 um 00:03 schrieb Wessels, Duane:
>> I think you might be the first person to argue for supporting multiple ZONEMD algorithms per zone. I actually expected more.
> 
> I remember Stephen Farrell saying something like "while designing new protocols, algorithm agility is an important point"
> We see the results today in DKIM and DNSSEC. It's really hard to change crypto primitives.

The current ZONEMD draft fully supports algorithm agility. What it doesn't support is multiple hashes *within a single message*. Having seen how easy it is to screw up OpenPGP and S/MIME message processing to handle multiple hashes, I think having one hash per zone is much more likely to work.

--Paul Hoffman