Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usage-02.txt
Scott Kitterman <sklist@kitterman.com> Mon, 12 June 2017 14:32 UTC
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From: Scott Kitterman <sklist@kitterman.com>
To: dcrup@ietf.org
Date: Mon, 12 Jun 2017 10:32:51 -0400
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Subject: Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usage-02.txt
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On Monday, June 12, 2017 08:20:18 AM Martin Thomson wrote: > On 12 June 2017 at 04:25, Murray S. Kucherawy <superuser@gmail.com> wrote: > > On Sun, Jun 11, 2017 at 1:40 AM, Martin Thomson <martin.thomson@gmail.com> > > > > wrote: > >> https://github.com/kitterma/draft-ietf-dcrup-dkim-usage/pull/1 > >> > >> I think that I got the essence of your changes there. And it's a lot > >> shorter. > > > > Can you explain what you mean by "rely on"? > > Sure, that's probably a bit of an imprecise way of saying that a > verifier needs to insist on receiving a valid rsa-sha256 signature and > that it can't just fall back to rsa-sha1. The way to do that would be to remove it from the protocol, which you seem to oppose, so I'm confused. > > So by that logic, you can put a 1156-bit key in a record now without > > changing anything. For anything bigger you will need multiple > > character-strings in the TXT field which I believe is one of the things > > John says doesn't fly in current provisioning software. > > 1156 is better, but I was hoping for a bit higher than that. I would > include text that suggests this (explaining the limitations you set > out regarding the whitespace and so forth), but note that the > additional security margin is, well, marginal. 1024 is operationally very common. In the end, if it matters, I don't mind adding this discussion, but I also don't see any reason to set the floor higher than 1024 (I don't think there's enough security advantage in 1156 over 1024 to matter). Scott K
- [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usage-0… internet-drafts
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Scott Kitterman
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Russ Housley
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Mark D. Baushke
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Scott Kitterman
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Martin Thomson
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Scott Kitterman
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Martin Thomson
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Murray S. Kucherawy
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Murray S. Kucherawy
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Martin Thomson
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… John Levine
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… Martin Thomson
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… Eric Rescorla
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… John R Levine
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… Martin Thomson
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… Eric Rescorla
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… Phillip Hallam-Baker
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… Salz, Rich
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… Salz, Rich
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Scott Kitterman
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Martin Thomson
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Scott Kitterman
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Salz, Rich
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Jim Fenton
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Murray S. Kucherawy
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Scott Kitterman
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Martin Thomson
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Martin Thomson
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Murray S. Kucherawy
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Murray S. Kucherawy
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Jim Fenton
- Re: [Dcrup] I-D Action: draft-ietf-dcrup-dkim-usa… Murray S. Kucherawy
- Re: [Dcrup] stronger crypto, I-D Action: draft-ie… Phillip Hallam-Baker