Re: [dane] I-D Action: draft-ietf-dane-smime-04.txt

Viktor Dukhovni <viktor1dane@dukhovni.org> Fri, 10 January 2014 02:17 UTC

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Date: Fri, 10 Jan 2014 02:17:46 +0000
From: Viktor Dukhovni <viktor1dane@dukhovni.org>
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References: <89AE05E1-BC6C-46BA-A4CC-A8F29070096D@vpnc.org> <CEF43EFD.F8FB%bdickson@verisign.com> <20140109173943.GL2317@mournblade.imrryr.org> <m37ga9kkfs.fsf@carbon.jhcloos.org> <20140109205604.GM2317@mournblade.imrryr.org> <alpine.LFD.2.10.1401091922410.5593@bofh.nohats.ca> <20140110004954.GQ2317@mournblade.imrryr.org> <m3zjn4k2zu.fsf@carbon.jhcloos.org>
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Subject: Re: [dane] I-D Action: draft-ietf-dane-smime-04.txt
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On Thu, Jan 09, 2014 at 09:02:36PM -0500, James Cloos wrote:

> VD> Email addresses are still (multiple failed[*] attempts at SMTP + UTF-8
> VD> addresses notwithstanding) US-ASCII strings.
> 
> One of the reasons for base32 in the original smime draft was that some
> sites have local email addresses which differ only in case.
> 
> upper() vs lower() vs nothing(), as well as whether to strip some suffix
> or other are still a valid local policy issue when normalizing the strings
> before hashing or base32ing.

How does this bear on the encoding lookup key labels? Any encoding
(e.g. base32, or HMAC-SHA-224, but not punycode) that does not map
input strings that differ only in case to output strings that differ
only in case offers no advantage over a 1-way hash function.

I am not sure what you're getting at.  Perhaps I'm missing something.

-- 
	Viktor.