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Re: [TLS] WGLC: draft-ietf-tls-session-hash

Nico Williams <nico@cryptonector.com> Mon, 24 November 2014 17:31 UTC

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Date: Mon, 24 Nov 2014 11:31:44 -0600
From: Nico Williams <nico@cryptonector.com>
To: Yoav Nir <ynir.ietf@gmail.com>
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Cc: Stephen Checkoway <s@pahtak.org>, "TLS@ietf.org (tls@ietf.org)" <tls@ietf.org>
Subject: Re: [TLS] WGLC: draft-ietf-tls-session-hash
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On Mon, Nov 24, 2014 at 04:22:25PM +0200, Yoav Nir wrote:
> > The draft currently says "Clients and servers SHOULD NOT resume
> > sessions that do not use the extended master secret..." Are you
> > saying you want that to be MUST NOT?
> 
> I missed that line.
> 
> What I was suggesting was that servers MUST NOT resume sessions that
> were negotiated without the extended master secret in handshakes that
> do have the extension.

Or they must not support tls-unique CB extraction (or the key exporter)
in that case.  But I prefer the "MUST NOT resume" language.

Nico
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