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Re: [babel] Secdir early review of draft-ietf-babel-dtls-03

David Schinazi <dschinazi.ietf@gmail.com> Sat, 02 February 2019 01:24 UTC

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From: David Schinazi <dschinazi.ietf@gmail.com>
Date: Sat, 02 Feb 2019 10:24:10 +0900
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To: Juliusz Chroboczek <jch@irif.fr>
Cc: Sean Turner <sean@sn3rd.com>, secdir@ietf.org, draft-ietf-babel-dtls.all@ietf.org, ietf@ietf.org, Babel at IETF <babel@ietf.org>
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Subject: Re: [babel] Secdir early review of draft-ietf-babel-dtls-03
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Hi Juliusz,

TLS 1.3 changed the handshake, making false start irrelevant.
In 1.3, the first flight of server-client packets contains the Finished
message,
so there is no opportunity to start early as there is in 1.2.

https://tools.ietf.org/html/rfc6347#section-4.2.4
https://tools.ietf.org/html/draft-ietf-tls-dtls13-30#section-5.6

David

On Sat, Feb 2, 2019 at 10:17 AM Juliusz Chroboczek <jch@irif.fr> wrote:

> >     6) AppA - I think you might need to tweak the last sentence in light
> 1.3?
>
> > Unfortunately DTLS 1.3 hasn't been published yet,
>
> May I most humbly request an explanation?  Is that about TLS False Start
> being made obsolete by TLS 1.3?
>
> (Note that I'm not particularly convinced about this paragraph, since
> I don't think that paying one extra RTT at neighbour acquisition is at all
> prohibitive.)
>
> -- Juliusz
>

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