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Re: [Ntp] Antwort: Re: Antwort: Why Roughtime?

Daniel Franke <dfoxfranke@gmail.com> Mon, 18 December 2023 19:43 UTC

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From: Daniel Franke <dfoxfranke@gmail.com>
Date: Mon, 18 Dec 2023 14:43:45 -0500
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To: Hal Murray <halmurray@sonic.net>
Cc: Watson Ladd <watsonbladd@gmail.com>, ntp@ietf.org
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Subject: Re: [Ntp] Antwort: Re: Antwort: Why Roughtime?
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On Mon, Dec 18, 2023 at 2:29 PM Hal Murray <halmurray@sonic.net> wrote:
> NTS already signs each packet.  The catch is that the key used for the signing
> is a shared secret setup by NTS-KE.  What's missing is a way to prove that the
> key the client is using was used by the desired server.  We can get that by
> extending NTS-KE to include signing the shared keys.

Signing it during NTS-KE doesn't change that fact that it's a
symmetric key, which means the client controls it too and could use it
to forge malfeasance proofs.

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