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Re: [TLS] History of extensions

Nicolas Williams <Nicolas.Williams@sun.com> Fri, 13 November 2009 16:57 UTC

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Date: Fri, 13 Nov 2009 10:46:09 -0600
From: Nicolas Williams <Nicolas.Williams@sun.com>
To: Eric Rescorla <ekr@networkresonance.com>
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References: <20091112181844.GE1105@Sun.COM> <200911122036.nACKa96m016227@fs4113.wdf.sap.corp> <20091112203847.GL1105@Sun.COM> <20091113082235.C55F469F381@kilo.networkresonance.com>
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Subject: Re: [TLS] History of extensions
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On Fri, Nov 13, 2009 at 10:22:35AM +0200, Eric Rescorla wrote:
> At Thu, 12 Nov 2009 14:38:47 -0600, > Nicolas Williams wrote:
> > Interestingly, that approach could even be used on initial connections
> > to detect if the server will support secure re-negotiation _before_ the
> > client ever tries it.
> 
> I don't see that. AFAICT both your options involve the client generating a 
> hello extension, so this does affect the bits on the wire. Obviously
> there are approaches which don't require that, but they don't provide
> detection of server capabilities on initial negotiation. By contrast
> your message of 1854 doesn't allow the client to probe the server 
> AFAICT.

The post with message-ID <20091113005419.GQ1105@Sun.COM>, subject
"Comments on draft-rescorla-tls-renegotiate", sent at 18:54:19 -0600
yesterday most certainly described no Hello extensions, only a Finished
message verify_data computation change.

Nico
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