Re: [Lwip] I-D Action: draft-ietf-lwig-curve-representations-05.txt

[Rene Struik <[e-mail]>]

Hi Mohit:

Great suggestion. I just posted an updated document that reflects this.

Best regards, Rene

On 5/16/2019 8:25 AM, Mohit Sethi M wrote:
>
> Hi Rene,
>
> Thanks for addressing the comments. I wasn't looking for exact 
> computational cost comparisons and rather some hints on what to expect 
> if I re-use the underlying implementation of a different curve. Your 
> statement "the overall cost differential is somewhere in the interval 
> [1.00 - 1.25]" is useful (and perhaps sufficient).
>
> I had one remaining suggestion. RFC 7942 
> (https://tools.ietf.org/html/rfc7942) describes how to improve 
> awareness of running code. Perhaps you could add a section on 
> implementations of Wei25519: https://github.com/ncme/c25519 and that 
> tinydtls https://github.com/ncme/tinydtls now supports Wei25519.
>
> --Mohit
>
> On 5/15/19 10:21 PM, Rene Struik wrote:
>> Dear colleagues:
>>
>> I slightly updated the draft to address Mohit Sethi's comment [1] on 
>> trade-offs between code reuse and computational efficiency. To this 
>> end, I added a little section (now Section 6) on "implementation 
>> considerations" - see[2].
>>
>> As already suggested in [3], I did not give an explicit computational 
>> cost comparison, since this is highly device and application 
>> dependent and alone would not do justice other considerations that 
>> come into play when deciding on a crypto implementation strategy.
>>
>> Best regards, Rene
>>
>> [1]https://mailarchive.ietf.org/arch/msg/lwip/DQ5oYwFusICBx_llv1Wenc1EZCQ
>> [2]https://tools.ietf.org/html/draft-ietf-lwig-curve-representations-05#section-6
>> [3] 
>> https://mailarchive.ietf.org/arch/msg/lwip/vSnhe1lO03AfLONxHGmixuP4z64
>>
>> On 5/15/2019 3:04 PM, [e-mail] wrote:
>>> 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-05.txt
>>> 	Pages           : 62
>>> 	Date            : 2019-05-15
>>>
>>> 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-05
>>> https://datatracker.ietf.org/doc/html/draft-ietf-lwig-curve-representations-05
>>>
>>> A diff from the previous version is available at:
>>> https://www.ietf.org/rfcdiff?url2=draft-ietf-lwig-curve-representations-05
>>>
>>>
>>> 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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>>
>>
>> -- 
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