Re: [Ntp] I-D Action: draft-roughtime-aanchal-02.txt

Thomas Peterson <> Tue, 28 May 2019 15:01 UTC

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From: Thomas Peterson <>
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Date: Tue, 28 May 2019 16:01:19 +0100
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Subject: Re: [Ntp] I-D Action: draft-roughtime-aanchal-02.txt
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Thank you for publishing a new version of the draft.

Some feedback based on your new changes, the existing concerns raised 
prior not withstanding:

* Nit: "... violations are greater then a second the loss..." should be 
"greater than a second"
* You have not provided sufficient information for implementations on 
how to actually calculate time, only citing a single, out-of-publication 
reference. Besides Wikipedia and a humor page[0] stored on the Internet 
Archive, I have been unable to find a definitive source that describes 
MJD. Could you please in a future version describe in detail how an 
implementation take the time received and perform the necessary 
computation to something that could be applied to a system clock.
* Would it not be more appropriate to break up the MIDP value so the MJD 
day and time offset from midnight be pout into separate keys?
* Is there a specific reason why the document has now a mixture of "bit" 
and "byte"? For example, MIDP is 8 _bytes_, but RADI is 32 _bits_. It's 
reasonable to assume that a reader can distinguish, but having a mixture 
such as this could lead to errors in implementations due to reader error.



On 27/05/2019 17:03, wrote:
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Network Time Protocol WG of the IETF.
>          Title           : Roughtime
>          Authors         : Aanchal Malhotra
>                            Adam Langley
>                            Watson Ladd
> 	Filename        : draft-roughtime-aanchal-02.txt
> 	Pages           : 11
> 	Date            : 2019-05-27
> Abstract:
>     This document specifies Roughtime - a protocol that aims to achieve
>     rough time synchronization while detecting servers that provide
>     inaccurate time and providing cryptographic proof of their
>     malfeasance.
> 1
> The IETF datatracker status page for this draft is:
> There are also htmlized versions available at:
> A diff from the previous version is available at:
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at
> Internet-Drafts are also available by anonymous FTP at:
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