Re: [Acme] WG last call for draft-ietf-acme-email-smime-06

"A. Schulze" <sca@andreasschulze.de> Tue, 31 March 2020 22:24 UTC

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From: "A. Schulze" <sca@andreasschulze.de>
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Date: Wed, 1 Apr 2020 00:24:16 +0200
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Subject: Re: [Acme] WG last call for draft-ietf-acme-email-smime-06
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Am 12.03.20 um 19:51 schrieb Salz, Rich:
> This mail begins a one-week working group last call on https://datatracker.ietf.org/doc/draft-ietf-acme-email-smime/?include_text=1
(hopefully not to late ...)

Hello @all,

I became aware of a privacy problem once an ACME instance will implement this draft: CT logs.
Usually the space of local parts for a domains email addresses is private. Enumeration is impossible and unwanted.
But CT logs change some assumptions people may have...

On the other side the problem isn't really new.
Similar applies to the hosts available inside a domain.
Similar applies to DNSSEC signed domains. But at least there is an option to make a zone-walk harder: NSEC3

Is this at least a point to be mentioned in the drafts security section?

Andreas