[147231] in cryptography@c2.net mail archive
Re: [Cryptography] PRISM-Proofing and PRISM-Hardening
daemon@ATHENA.MIT.EDU (Viktor Dukhovni)
Wed Sep 18 19:16:58 2013
X-Original-To: cryptography@metzdowd.com
Date: Wed, 18 Sep 2013 21:50:31 +0000
From: Viktor Dukhovni <cryptography@dukhovni.org>
To: cryptography@metzdowd.com
In-Reply-To: <20130918204717.GY29796@mournblade.imrryr.org>
Reply-To: cryptography@metzdowd.com
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com
On Wed, Sep 18, 2013 at 08:47:17PM +0000, Viktor Dukhovni wrote:
> On Wed, Sep 18, 2013 at 08:04:04PM +0100, Ben Laurie wrote:
>
> > > This is only realistic with DANE TLSA (certificate usage 2 or 3),
> > > and thus will start to be realistic for SMTP next year (provided
> > > DNSSEC gets off the ground) with the release of Postfix 2.11, and
> > > with luck also a DANE-capable Exim release.
> >
> > What's wrong with name-constrained intermediates?
>
> X.509 name constraints (critical extensions in general) typically
> don't work.
And public CAs don't generally sell intermediate CAs with name
constraints. Rather undercuts their business model.
--
Viktor.
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