Re: [TLS] draft-green-tls-static-dh-in-tls13-01

Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com> Sun, 16 July 2017 09:44 UTC

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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Sun, 16 Jul 2017 05:43:56 -0400
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To: "Salz, Rich" <rsalz@akamai.com>
Cc: =?UTF-8?Q?Colm_MacC=C3=A1rthaigh?= <colm@allcosts.net>, Matthew Green <matthewdgreen@gmail.com>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [TLS] draft-green-tls-static-dh-in-tls13-01
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On Sun, Jul 16, 2017 at 5:14 AM, Salz, Rich <rsalz@akamai.com>; wrote:
> Within an enterprise that believes they need this kind of
> packet-capture-decode thing, what are the other benefits of TLS 1.3?  They
> can already use good ciphers. They save the cost of not uplifting existing
> infrastructure. They lose 0RTT early-data, which when viewed globally seems
> like a reasonable trade-off.

 My guess is that industries interested in the DH key proposal would
want 0-RTT.  I think they would want to prevent replay attacks and
might even see configuration errors of this as a risk (allowing 0-RTT
inadvertently).

>
>
> I am much more cynical about the value of opt-in.  I mean, what are you
> expecting users to agree to?  And globally, what infinitesimal portion of
> the Web population can make an informed choice?  And often there is no
> choice – one of the advocates here is from a statewide insurance company.
>
>
>
> So what is compelling about TLS 1.3 after you take away forward secrecy?  I
> really want to hear an answer to that question from folks who say they need
> TLS 1.3 but without it.
>
>
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>



-- 

Best regards,
Kathleen