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

"Salz, Rich" <rsalz@akamai.com> Tue, 21 June 2016 10:59 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Hal Murray <hmurray@megapathdsl.net>, Harlan Stenn <stenn@ntp.org>
Thread-Topic: [ntpwg] Parsing NTP packets regarding MACs and EXTs.
Thread-Index: AQHRy6DQX/6oVm/mW0S5teuNJd2+v5/zwAiA
Date: Tue, 21 Jun 2016 10:58:32 +0000
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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>
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Subject: Re: [ntpwg] Parsing NTP packets regarding MACs and EXTs.
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> The simple shared key MACs include a 4 byte header.  MD5 mode has a 16
> byte hash for 20 bytes total.  SHA1 has a 20 byte hash for a 24 byte total.

And both of those are very very, and fairly, obsolete respectively.

No new security mechanism, and that's what we're defining here, should use anything less than SHA 256.
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