Re: [Lwip] Fwd: I-D Action: draft-ietf-lwig-curve-representations-04.txt

[Mohit Sethi M <[e-mail]>]

Hi Rene,

In Section 1, the draft says:

 Montgomery curve, and of points of Edwards25519, a so-called twisted
   Edwards curve, which are both specified in [RFC7748<https://tools.ietf.org/html/rfc7748>]

What about referencing RFC 8032: https://tools.ietf.org/html/rfc8032?

A lot of normative parts are currently in the appendix. Wouldn't it make sense to move them into the actual document body. I looked at RFC 7748 for example and it defines Curve25519 in the main body: https://tools.ietf.org/html/rfc7748#section-6.1. It is good to keep the example computations in  Appendix E.3 and Appendix G.3, see Appendix K as the document currently does.

In Section 5, wouldn't it make sense to mention that while re-using the same code base has advantages, it can also negatively affect the performance in terms of the computation time?

--Mohit

On 4/19/19 5:50 PM, Rene Struik wrote:

Dear colleagues:

I slightly updated the draft. Main changes: (technical) I added COSE parm requests (Section8.4-8.6); (editorial) some tiny word-smything and addition of two more references.

Of course, more references are possible, but - apart from that - I think the document is technically ready.

FYI - Stanislav Smyshlyaev and Vasily Nikolaev did kindly review the previous version of this draft and verified all numbers, formulas, etc. Their main editorial comment was that the document could use more references. {I will see whether I can find more references, or perhaps I should see if I can post a full technical paper on all kinds of curve formulas,, tricks, etc. This will take some time, though. This should not stop proceeding with this, imho.}

Best regards, Rene


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Subject:        [Lwip] I-D Action: draft-ietf-lwig-curve-representations-04.txt
Date:   Fri, 19 Apr 2019 07:33:44 -0700
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Light-Weight Implementation Guidance WG of the IETF.

Title : Alternative Elliptic Curve Representations
Author : Rene Struik
Filename : draft-ietf-lwig-curve-representations-04.txt
Pages : 61
Date : 2019-04-19

Abstract:
This document specifies how to represent Montgomery curves and
(twisted) Edwards curves as curves in short-Weierstrass form and
illustrates how this can be used to carry out elliptic curve
computations using existing implementations of, e.g., ECDSA and ECDH
using NIST prime curves.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lwig-curve-representations/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lwig-curve-representations-04
https://datatracker.ietf.org/doc/html/draft-ietf-lwig-curve-representations-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lwig-curve-representations-04


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

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