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Re: [babel] Mirja Kühlewind's Discuss on draft-ietf-babel-dtls-07: (with DISCUSS and COMMENT)

Juliusz Chroboczek <jch@irif.fr> Wed, 14 August 2019 17:10 UTC

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Date: Wed, 14 Aug 2019 19:10:06 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: Mirja Kuehlewind <ietf@kuehlewind.net>
Cc: babel-chairs <babel-chairs@ietf.org>, Babel at IETF <babel@ietf.org>, Donald Eastlake <d3e3e3@gmail.com>, The IESG <iesg@ietf.org>, David Schinazi <dschinazi.ietf@gmail.com>, draft-ietf-babel-dtls@ietf.org
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Subject: Re: [babel] Mirja Kühlewind's Discuss on draft-ietf-babel-dtls-07: (with DISCUSS and COMMENT)
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> Thanks for the detailed explanation. I believe the underlying problem is
> that in this approach the Hello is not authenticated.

Exactly.

One of the important properties of this protocol is that it uses
a previously standardised protocol (DTLS) for all crypto work.  David
feels that is important.  Since the IETF has not standardised any
general-purpose security mechanism that is suitable for protecting
multicast traffic, we're stuck.

(This is not a criticism of DTLS, which has a well-defined scope.  This
might or might not be a criticism of a now-concluded high-profile IETF WG.)

-- Juliusz

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