Re: [DNSOP] New Version of draft-ietf-dnsop-algorithm-update-00: Algorithm Implementation Requirements and Usage Guidance for DNSSEC

Ondřej Surý <ondrej@isc.org> Thu, 22 March 2018 17:48 UTC

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From: Ondřej Surý <ondrej@isc.org>
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Date: Thu, 22 Mar 2018 17:47:58 +0000
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Subject: Re: [DNSOP] New Version of draft-ietf-dnsop-algorithm-update-00: Algorithm Implementation Requirements and Usage Guidance for DNSSEC
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--
Ondřej Surý
ondrej@isc.org

> On 22 Mar 2018, at 17:27, Paul Wouters <paul@nohats.ca> wrote:
> 
> On Thu, 22 Mar 2018, Ondřej Surý wrote:
> 
>> https://github.com/oerdnj/draft-ietf-dnsop-algorithm-update
>> 
>> Pull/Merge Requests, Issues, etc. are welcome.
>> 
>> The most of the work done between the last version and this is:
>> 
>> * Removal of MUST-, SHOULD+, etc…
>> * Upgrade the urgency of deploying ECC
>> * Separate operational recommendations for default algorithm to ECDSAP256SHA256
>> * Deprecation of ECC-GOST (that actually happened elsewhere, so we reflect it here)
> 
> As for the DS algorithm 4, SHA-384 does not really add anything over
> SHA-256, so it would be good to move that further down from MAY to MUST
> NOT on the creation (not validation) part. I'm afraid the current
> listing might appear as "it is MAY now but will become MUST in the
> future".
> 
> Based on Viktor's data, the ratio of SHA256 to SHA384 is 500:1 with
> only 8649 DS SHA384 records. Even GOST which is MUST NOT has 4x more
> DS records deployed with 36388 records.

Sounds good to me, you already have access to the repo :).

> I think this text also needs an update:
> 
> 	RSASHA1 and RSASHA1-NSEC3-SHA1 are widely deployed, although zones
> 	deploying it are recommended to switch to ECDSAP256SHA256 as there is
> 	an industry-wide trend to move to elliptic curve cryptography.
> 
> They should switch away from SHA1 as SHA1 is being deprecated industry
> wide. Even if we recommend to move away from RSA (which I'm not sure if there
> is consensus on) to ECC, I would like to move them to ED25519/ED448 over
> the ECDSA* variants.

I don’t think this is currently feasible to do so, so we need to have a feedback from WG.

> If it is too soon for that now, I would simply not
> recommend moving away from RSA. And maybe make ECDSAP256SHA256 a MAY
> instead of a MUST.

What would be the technical/security reason for skipping ECDSA?

Ondrej