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

"Salz, Rich" <rsalz@akamai.com> Tue, 21 June 2016 15:52 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: "mayer@ntp.org" <mayer@ntp.org>, Daniel Franke <dfoxfranke@gmail.com>
Thread-Topic: [ntpwg] Parsing NTP packets regarding MACs and EXTs.
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Date: Tue, 21 Jun 2016 15:51:54 +0000
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References: <stenn@ntp.org> <E1bFCJh-000G0C-Bf@stenn.ntp.org> <20160621093932.BD9A7406057@ip-64-139-1-69.sjc.megapath.net> <f4f6f8f969ac49ff819ccae06ec2e3db@usma1ex-dag1mb1.msg.corp.akamai.com> <d5934cd7-5808-3e2b-3ed6-b5e1b3f9e2df@ntp.org> <CAJm83bAHcSQtOHRjUHVk7o27KmbSqH_dad+dLMAhQ6Vh3hnsWw@mail.gmail.com> <d201d6d1-e769-c9c3-492c-409f129e54a9@ntp.org>
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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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> Yes, the intention is to relegate the old MAC to existing usage and only use
> EF MAC for future use. We are also planning to move to GMAC for hashing
> algorithms.

Why?  I understand AES-GCM as it's widespread and has hardware assist on most server platforms, but why GMAC and not one of the more common mechanisms?
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