Re: [TLS] Zero-RTT Data & PSK

Eric Rescorla <ekr@rtfm.com> Tue, 11 October 2016 16:24 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 11 Oct 2016 09:23:41 -0700
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To: Hannes Tschofenig <hannes.tschofenig@gmx.net>
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Subject: Re: [TLS] Zero-RTT Data & PSK
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This LGTM. Absent objections I will merge tomorrow

On Tue, Oct 11, 2016 at 9:22 AM, Hannes Tschofenig <
hannes.tschofenig@gmx.net>; wrote:

> I gave it a try, see
> https://github.com/tlswg/tls13-spec/pull/668/commits/
> 91e5b39e5f0ce62a90effdbaf4e3c90ed0d81245
>
>
> Ciao
> Hannes
>
>
> On 10/10/2016 11:59 PM, Eric Rescorla wrote:
> > I agree with MT. Hannes, if you want to clean up the text to take into
> > account MT's comments, I will merge
> >
> > On Sat, Sep 10, 2016 at 3:35 AM, Martin Thomson
> > <martin.thomson@gmail.com <mailto:martin.thomson@gmail.com>> wrote:
> >
> >     On 9 September 2016 at 23:37, Hannes Tschofenig
> >     <hannes.tschofenig@gmx.net <mailto:hannes.tschofenig@gmx.net>>
> wrote:
> >     > I am wondering why I cannot use Zero-RTT with just PSK-based
> authentication
> >     > (without a prior ticket change).
> >
> >     I think that you would need to bind more things to the key in that
> >     case, but I assume that it would be OK if you did so.  You already
> >     need to pair a PSK with a hash, but if you paired it with a whole
> >     cipher suite instead and also the ALPN (which could be null), then I
> >     see no reason not to permit 0-RTT for pure PSK.  (I think that cipher
> >     suite + ALPN is sufficient, but someone can correct me if I missed
> >     anything.)
> >
> >     _______________________________________________
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> >
> >
>
>