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Re: [TLS] analysis of wider impact of TLS1.3 replayabe data

Ilari Liusvaara <ilariliusvaara@welho.com> Mon, 14 March 2016 18:41 UTC

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Date: Mon, 14 Mar 2016 20:41:53 +0200
From: Ilari Liusvaara <ilariliusvaara@welho.com>
To: Colm MacCárthaigh <colm@allcosts.net>
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Subject: Re: [TLS] analysis of wider impact of TLS1.3 replayabe data
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On Mon, Mar 14, 2016 at 09:15:17AM -0700, Colm MacCárthaigh wrote:
> On Mon, Mar 14, 2016 at 4:32 AM, Eric Rescorla <ekr@rtfm.com> wrote:
> 
> > For 1. Raw data throughput could be improved by envelope encrypting the
> > early data; and transferring the envelope key only once the session has
> > been fully authenticated
> >

Unfortunately, that doesn't work for things like protocol banners or
other things that can be sent in 0-RTT and replied to in 0.5-RTT.


(Also, with regards to my comment about cryptographic screwedness,
such screwedness is not inherent in DH-0RTT, but is consequence of
the current implementation).


-Ilari

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