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Re: [Ntp] Antw: [EXT] Re: Splitting the Roughtime draft?

Warner Losh <imp@bsdimp.com> Mon, 01 February 2021 21:40 UTC

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From: Warner Losh <imp@bsdimp.com>
Date: Mon, 01 Feb 2021 14:40:21 -0700
Message-ID: <CANCZdfrCnkyw88wdznGD-3PgF1taMx1ZMNdvV8OP_ATsK413bg@mail.gmail.com>
To: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
Cc: "ntp@ietf.org" <ntp@ietf.org>, Hal Murray <hmurray@megapathdsl.net>
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Subject: Re: [Ntp] Antw: [EXT] Re: Splitting the Roughtime draft?
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On Mon, Feb 1, 2021 at 12:29 AM Ulrich Windl <
Ulrich.Windl@rz.uni-regensburg.de> wrote:

> >>> Hal Murray <hmurray@megapathdsl.net> schrieb am 31.01.2021 um 10:06 in
> Nachricht <20210131090607.ED116406061@ip-64-139-1-69.sjc.megapath.net>:
>
> > marcus@dansarie.se said:
> >> I think we need to be very clear about the fact that all trust in
> Roughtime
> >> is rooted in the long‑term keys and that they are expected to be valid
> for
> a
> >> very long time indeed.
> >
> > How long is "very long"?
>
> The "industry standard" seems to be 10 years for that, while "long"
> nowadays
> is probably only two years...
>

Consumer grade stuff is like 1-2 years. But deployed, embedded gear still
needs 5-10 years depending on the segment it is in. You don't want to climb
a lot of telephone poles to redeploy every couple of years, for example...

Warner


> >
> > I've been trying to figure out how to use Roughtime to get NTS off the
> > ground
> > when the time isn't known/trusted yet.  If it needs long term keys, is
> there
>
> >
> > any advantage to long‑term Roughtime keys as compared to trusted
> certificates
> >
> > with a long lifetime?
> >
> > ‑‑
> > These are my opinions.  I hate spam.
> >
> >
> >
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