Re: [Ntp] [internet-drafts@ietf.org: New Version Notification for draft-gruessing-ntp-ntpv5-requirements-02.txt]

Miroslav Lichvar <mlichvar@redhat.com> Tue, 15 June 2021 12:58 UTC

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Date: Tue, 15 Jun 2021 14:58:11 +0200
From: Miroslav Lichvar <mlichvar@redhat.com>
To: Danny Mayer <mayer@pdmconsulting.net>
Cc: James <james.ietf@gmail.com>, ntp@ietf.org
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Subject: Re: [Ntp] [internet-drafts@ietf.org: New Version Notification for draft-gruessing-ntp-ntpv5-requirements-02.txt]
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On Mon, Jun 14, 2021 at 02:25:21PM -0400, Danny Mayer wrote:
> > - "Encryption and authentication MUST be provided by the protocol
> >     specification as a default"
> > 
> >    It's not clear to me what the default means here. That it is enabled
> >    by default in all implementations that support it?
> 
> We should certainly NOT be doing encryption on an NTP packet? What are you
> trying to hide? Timestamps are obsolete almost before you use them and there
> is nothing confidential about them. Authentication IS important and should
> be secured by protocols like NTS or MAC's or (let me say it anyway!)
> Autokey.

Encryption is needed for privacy. It's an NTS feature. It encrypts
cookies in server responses to prevent a passive observer from
matching client requests using the cookies.

-- 
Miroslav Lichvar