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Re: [TLS] extending the un-authenticated DTLS header

Nikos Mavrogiannopoulos <nmav@redhat.com> Tue, 15 November 2016 07:13 UTC

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From: Nikos Mavrogiannopoulos <nmav@redhat.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, "tls@ietf.org" <tls@ietf.org>
Date: Tue, 15 Nov 2016 08:12:57 +0100
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Cc: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
Subject: Re: [TLS] extending the un-authenticated DTLS header
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On Tue, 2016-11-15 at 01:10 +0000, Stephen Farrell wrote:

> > Would it make sense to introduce an extension header for DTLS 1.3
> > in
> > the lines of the IPv6 extension headers? That would allow TLS
> > extension
> > negotiation to add more items on the un-authenticated header, and
> > potentially also remove redundant headers. 
> 
> I'd be interested in an analysis of the potential privacy
> impacts of this. Isn't this more or less the same as doing
> SPUD-for-DTLS? (If not, sorry for dragging in controversy:-)

You can check the security considerations section of the latest draft:
https://github.com/thomas-fossati/draft-tls-cid/blob/master/draft-mavrogiannopoulos-tls-cid.md

TLDR; the privacy offered by this extension is the same as the privacy
of DTLS over UDP.

regards,
Nikos

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