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Re: [Ntp] Benjamin Kaduk's Discuss on draft-ietf-ntp-using-nts-for-ntp-23: (with DISCUSS and COMMENT)

Sandra Murphy <sandy@tislabs.com> Thu, 26 March 2020 12:03 UTC

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From: Sandra Murphy <sandy@tislabs.com>
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Date: Thu, 26 Mar 2020 08:03:09 -0400
Cc: Sandra Murphy <sandy@tislabs.com>, Ragnar Sundblad <ragge@netnod.se>, ntp-chairs@ietf.org, ntp@ietf.org, Karen O'Donoghue <odonoghue@isoc.org>, The IESG <iesg@ietf.org>, draft-ietf-ntp-using-nts-for-ntp@ietf.org
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To: Benjamin Kaduk <kaduk@mit.edu>
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Subject: Re: [Ntp] Benjamin Kaduk's Discuss on draft-ietf-ntp-using-nts-for-ntp-23: (with DISCUSS and COMMENT)
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> On Mar 19, 2020, at 5:21 PM, Benjamin Kaduk <kaduk@mit.edu> wrote:
> 
>>> 
>>> Section 4
>>> 
>>> Is there any significance to the ordering of records within a message
>>> (other than End of Message)?
>> 
>> No.


Actually, there is a bit of ordering significance.  The NTS Authenticator and Encrypted Extension Fields extension field provides authentication of the NTP protocol header and extension fields that precede it.  Extension headers that follow that extension field are neither authenticated nor encrypted.

—Sandy

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