Re: [DNSOP] New Version Notification for draft-wessels-dns-zone-digest-01.txt

Shumon Huque <shuque@gmail.com> Wed, 20 June 2018 00:26 UTC

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From: Shumon Huque <shuque@gmail.com>
Date: Tue, 19 Jun 2018 20:25:46 -0400
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To: "Wessels, Duane" <dwessels@verisign.com>
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Subject: Re: [DNSOP] New Version Notification for draft-wessels-dns-zone-digest-01.txt
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On Tue, Jun 19, 2018 at 2:56 PM Wessels, Duane <dwessels@verisign.com>;
wrote:

> >
> > * If the goal is to support secure acquisition of the zone outside the
> DNS protocol, then it can't do that. But neither is ZONEMD needed for that
> - we can use an out of band signature using a variety of methods.
>
> Yes, this is the crux of it for me and the other authors as well I
> believe.  In my opinion, detached signatures/checksums are not good
> enough.  Our not-yet-released -02 draft has this new text:
>
> 1.1.2.  Detached Signatures
>
>    Sometimes, detached checksums and signatures can be found adjacent to
>    zone files.  This is the case for the root and other zone files
>    published on the internic.net sites [InterNIC].  For example, the
>    files root.zone.md5 and root.zone.sig are in the same directory as
>    the root.zone file.  Unfortunately, since the checksum and signature
>    are in separate files, they are only weakly associated with the zone
>    file.  They remain associated only if the recipient is careful to
>    keep them together.  Nothing in these files, other than their names
>    and timestamps, ties them to a specific revision of the root.zone
>    file.
>

Hi Duane,

If you make this comparison, I think you should also mention that there are
many integrated signature/data formats too (supported in PGP, S/MIME, CMS,
PKCS7 etc) that can address your 'weakly associated' critique of detached
signatures. And then argue why the zonemd scheme is superior to those. I
guess one argument is that it uses keys that are already resident in the
DNS and doesn't rely on external protocols?

Shumon.