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Re: [babel] Secdir last call review of draft-ietf-babel-rtt-extension-04

Juliusz Chroboczek <jch@irif.fr> Tue, 10 October 2023 10:04 UTC

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Date: Tue, 10 Oct 2023 12:03:51 +0200
Message-ID: <87bkd6ztdk.wl-jch@irif.fr>
From: Juliusz Chroboczek <jch@irif.fr>
To: Shivan Sahib <shivankaulsahib@gmail.com>
Cc: secdir@ietf.org, babel@ietf.org, draft-ietf-babel-rtt-extension.all@ietf.org, last-call@ietf.org
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Subject: Re: [babel] Secdir last call review of draft-ietf-babel-rtt-extension-04
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Thanks, Shivan.

> From reading the Security Considerations of RFC 8966 (last para), it
> seems that geolocation privacy was a concern with the original Babel
> spec. Allowing extremely-fine-grained (1 microsecond) RTT measurements
> makes that infinitely worse, especially for users on mobile or behind
> VPNs, who typically have special privacy needs.

I agree.  I'll add some wording to that effect to the Security Considerations.

> The IETF has thought a lot about privacy concerns with RTT measurement and how
> to balance them with operational needs,

I'll be grateful for a reference.

Thanks again,

-- Juliusz

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