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Re: [babel] Comments on the MAC authentication for Babel draft

Donald Eastlake <d3e3e3@gmail.com> Thu, 27 August 2020 20:41 UTC

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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Thu, 27 Aug 2020 16:41:17 -0400
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To: Juliusz Chroboczek <jch@irif.fr>
Cc: Antonin Décimo <antonin.decimo@gmail.com>, Babel at IETF <babel@ietf.org>
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Subject: Re: [babel] Comments on the MAC authentication for Babel draft
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Hi Juliusz,

On Thu, Aug 27, 2020 at 8:58 AM Juliusz Chroboczek <jch@irif.fr> wrote:
>
> >>> 4. Accepting Challenges
> >>
> >>> When receiving a challenge reply, a node must check if there was a
> >>> challenge in progress before validating the challenge.
> >>
> >>> However the text does not explicitly describe if there are changes
> >>> to be made to the overall state when the challenge succeeds.
>
> >> Right.  The obvious implementation strategy is to discard the challenge
> >> state after a challenge has succeeded.  Not doing that does not cause any
> >> security issues (it's not required by the proof of correctness).
> >>
> >> I think we should add « SHOULD discard the state » here, but it requires
> >> Donald's permission.
>
> > I think adding this "SHOULD" would be too much of a change. In principle it
> > doesn't require my permission, it requires Martin Vigoureux's permission since
> > the draft is out of the WG and in the IESG.
>
> Shall I ask Martin?

You are welcome to do so if you want.

Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 2386 Panoramic Circle, Apopka, FL 32703 USA
 d3e3e3@gmail.com

> > Since it doesn't affect correct operation, I would suggest just creating a
> > draft-ietf-babel-hmacbis-00 draft and putting it in that.
>
> I'm not volunteering.
>
> -- Juliusz

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