Re: [TLS] History of extensions

Eric Rescorla <ekr@networkresonance.com> Sat, 14 November 2009 09:03 UTC

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Date: Sat, 14 Nov 2009 11:05:18 +0200
From: Eric Rescorla <ekr@networkresonance.com>
To: Nicolas Williams <Nicolas.Williams@sun.com>
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Subject: Re: [TLS] History of extensions
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At Sat, 14 Nov 2009 02:28:13 -0600,
Nicolas Williams wrote:
> 
> On Sat, Nov 14, 2009 at 01:08:16AM +0200, Eric Rescorla wrote:
> > At Fri, 13 Nov 2009 10:46:09 -0600,
> > Nicolas Williams wrote:
> > > 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.
> > 
> > Yes, and it doesn't allow you to probe in a compatible way.
> 
> No, that's not correct.  On initial connection there's no need to do
> anything special (sure, it's nice to know that your peer doesn't have
> this vuln, but you don't have to).

Well, I don't know what "have to" means. Some clients may have
the policy of not connecting to servers that aren't upgraded.
The existing proposal allows that. Yours does not.

-Ekr