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Re: [TLS] Call for consensus: Removing DHE-based 0-RTT

Joseph Salowey <joe@salowey.net> Wed, 18 May 2016 17:16 UTC

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From: Joseph Salowey <joe@salowey.net>
Date: Wed, 18 May 2016 10:15:39 -0700
Message-ID: <CAOgPGoARXktjxRiYG+ZUt3Y7fU_D6YFUHKp0moT42ahq5NhG-w@mail.gmail.com>
To: Sean Turner <sean@sn3rd.com>
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Subject: Re: [TLS] Call for consensus: Removing DHE-based 0-RTT
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The discussion on the list supports the consensus in the IETF 95 meeting to
remove DHE-based 0-RTT modes.  The mode should be removed from the draft.

Cheers,

J&S

On Tue, Mar 29, 2016 at 6:11 AM, Sean Turner <sean@sn3rd.com> wrote:

> All,
>
> To make sure we’ve got a clear way forward coming out of our BA sessions,
> we need to make sure there’s consensus on a couple of outstanding issues.
> So...
>
> There also seems to be (rougher) consensus not to support 0-RTT via DHE
> (i.e., semi-static DHE) in TLS 1.3 at this time leaving the only 0-RTT mode
> as PSK. The security properties of PSK-based 0-RTT and DHE-based 0-RTT are
> almost identical, but 0-RTT PSK has better performance properties and is
> simpler to specify and implement. Note that this does not permanently
> preclude supporting DHE-based 0-RTT in a future extension, but it would not
> be in the initial TLS 1.3 RFC.
>
> If you think that we should keep DHE-based 0-RTT please indicate so now
> and provide your rationale.
>
> J&S
>
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