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Re: [ntpwg] Parsing NTP packets regarding MACs and EXTs.

Harlan Stenn <stenn@ntp.org> Wed, 22 June 2016 22:03 UTC

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From: Harlan Stenn <stenn@ntp.org>
To: "Salz, Rich" <rsalz@akamai.com>
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References: Message from Harlan Stenn <stenn@ntp.org> of "Tue, 21 Jun 2016 03:25:32 -0000." <E1bFCJh-000G0C-Bf@stenn.ntp.org> <20160621093932.BD9A7406057@ip-64-139-1-69.sjc.megapath.net> <f4f6f8f969ac49ff819ccae06ec2e3db@usma1ex-dag1mb1.msg.corp.akamai.com> <E1bFURY-000H2p-G8@stenn.ntp.org> <70060988e192497caf2402dec106e8b2@usma1ex-dag1mb1.msg.corp.akamai.com>
Comments: In-reply-to "Salz, Rich" <rsalz@akamai.com> message dated "Wed, 22 Jun 2016 14:01:18 +0000."
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Date: Wed, 22 Jun 2016 22:00:54 +0000
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Subject: Re: [ntpwg] Parsing NTP packets regarding MACs and EXTs.
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Cc: "ntpwg@lists.ntp.org" <ntpwg@lists.ntp.org>, Hal Murray <hmurray@megapathdsl.net>
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"Salz, Rich" writes:
> =20
> > But again, how thoroughly do you want to "protect" this 48-byte message?
> 
> The size of the message is not relevant; the importance of it is what
> counts.
> 
> I want to protect network-based time synchronization with
> best-practice security.

What do you mean by "protect"?

Seems to me the two concerns are:

- prevent spoofing
- detect tampering

and we need to identify ways to do this that are not too expensive.

H
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