Re: [Lwip] WGLC for draft-ietf-lwig-crypto-sensors-03

[Zhen Cao <[e-mail]>]

Hi Mohit,

>From the discussion, the potential update is not substantial to the
key technique part of this document, it will be fine that we move the
new version to the next step.

BR,
Zhen

On Tue, Aug 8, 2017 at 5:48 PM, Mohit Sethi <[e-mail]> wrote:
> Hi Tobias
>
> Your proposed text sounds good to me and I will update the document to
> reflect the changes suggested.
>
> @Chairs: A procedural question; should I go ahead and submit another update
> as the deadline for last call is now over?
>
> --Mohit
>
>
>
> On 08/08/2017 12:11 PM, Tobias Guggemos wrote:
>>
>> Hey,
>>
>> I don't think this needs another last call, if we don't want to broaden
>> the scope of the document.
>> I just feel that the proposed change would help to understand the actual
>> scope of the document for a first-time-reader.
>> Your proposed text helps, but you can certainly keep the "experiences"
>> part, I'd just state that the document presents experiences with signing:
>> The memo describes a possible deployment model where resource-constrained
>> devices sign message objects, discusses the availability of cryptographic
>> libraries for small device and presents some preliminary experiences with
>> those libraries for signing operation on small devices.
>>
>> Regards
>> Tobias
>>
>>
>> -----Ursprüngliche Nachricht-----
>> Von: Mohit Sethi [mailto:[e-mail]]
>> Gesendet: Montag, 7. August 2017 18:20
>> An: Tobias Guggemos <[e-mail]>; Carsten Bormann
>> <[e-mail]>
>> Cc: [e-mail]
>> Betreff: Re: AW: [Lwip] WGLC for draft-ietf-lwig-crypto-sensors-03
>>
>> Hi Tobias
>>
>> The abstract does say that "The memo describes a possible deployment model
>> suitable", the keyword being "a". I agree that the title is a bit broad but
>> that is because in section 13 and 14, we discuss some broader trade offs of
>> doing security at the different layers of the protocol stack. Perhaps the
>> abstract could use text "The memo describes a possible deployment model
>> where resource-constrained devices sign message objects, discusses the
>> availability of cryptographic libraries for small devices". If you think
>> this change is needed, I could update the draft and hopefully we don't have
>> to do another last call for this minor fix.
>>
>> --Mohit
>>
>>
>> On 08/07/2017 04:36 PM, Tobias Guggemos wrote:
>>>
>>> Hey Mohit,
>>> I see your point and that it is out of scope for the document. However, I
>>> feel the title and the abstract is then a bit misleading and should say that
>>> this document discusses security architectures and cryptographic functions
>>> for authentication/signing only?
>>> Just a thought to avoid missunderstandings.
>>> Regards
>>> Tobias
>>>
>>> -----Ursprüngliche Nachricht-----
>>> Von: Lwip [mailto:[e-mail]] Im Auftrag von Mohit Sethi
>>> Gesendet: Sonntag, 6. August 2017 21:10
>>> An: Carsten Bormann <[e-mail]>
>>> Cc: [e-mail]
>>> Betreff: Re: [Lwip] WGLC for draft-ietf-lwig-crypto-sensors-03
>>>
>>> Hi Carsten
>>>
>>> This document looks at a very specific deployment scenario where
>>> resource-constrained devices sign message objects. Therefore, it only
>>> documents the performance of ECDSA sign operation.
>>>
>>> I do think the numbers of Elliptic curve diffie-hellman key agreement are
>>> useful for the community and the group should work on documenting them. I
>>> did discuss this with Tobias (off-the-mailing list) and perhaps those
>>> numbers can go in a separate document on minimal G-IKEv2. I currently have a
>>> working implementation of x25519 Diffie-hellman key agreement on a R Pi but
>>> I don't consider it constrained enough. Once I have more numbers, I will
>>> definitely contribute. But for now I strongly believe that they don't fit
>>> into the current document.
>>>
>>> --Mohit
>>>
>>>
>>> On 08/06/2017 02:39 PM, Carsten Bormann wrote:
>>>>
>>>> Hi Mohit,
>>>>
>>>> One point that came up in the discussion in Prague was Diffie-Hellman
>>>> performance.
>>>> For a deployment that relies on symmetric keys for mutual
>>>> authentication, it may be useful to do an (ECC) D-H key agreement to achieve
>>>> forward security.
>>>> I believe some numbers for that are available?
>>>> It would be useful to include them in order to motivate the use of
>>>> forward secure key agreement.
>>>>
>>>> Grüße, Carsten
>>>>
>>>>
>>>>> On Aug 6, 2017, at 12:18, Mohit Sethi <[e-mail]>
>>>>> wrote:
>>>>>
>>>>> Hi all
>>>>>
>>>>> The authors of the document believe that it is ready to move forward.
>>>>> During the previous last call we had already received support from several
>>>>> working group members.
>>>>>
>>>>> Based on the feedback during the previous last call, we removed the
>>>>> performance measurements of RSA key sizes smaller than 2048 bits. We also
>>>>> added performance measurements of ECDSA sign operation on ARM 32-bit
>>>>> platforms. Additionally, we improved the text on the need for a random
>>>>> number generator, more guidance on choosing the right platform, and why
>>>>> larger flash memory size is needed for firmware updates. We also removed
>>>>> some extraneous text from the background section. Any further comments are
>>>>> welcome.
>>>>>
>>>>> --Mohit
>>>>>
>>>>>
>>>>> On 07/31/2017 04:23 AM, Zhen Cao wrote:
>>>>>>
>>>>>> Hello Everyone,
>>>>>>
>>>>>> This email starts the WGLC for draft-ietf-lwig-crypto-sensors-03
>>>>>> https://tools.ietf.org/html/draft-ietf-lwig-crypto-sensors-03
>>>>>>
>>>>>> This is a second WGLC with the new draft resolving the comments
>>>>>> received from last round.
>>>>>>
>>>>>> We still appreciate very much if could you help review the document
>>>>>> and send your comments to the mailing list. Thank you in advance.
>>>>>>
>>>>>> The WGLC will end in ONE week till August 7th, 2017.
>>>>>>
>>>>>> Thank the authors for their hard work again.
>>>>>>
>>>>>> Best regards,
>>>>>> Zhen
>>>>>>
>>>>>> On Wed, Feb 22, 2017 at 11:15 AM, Zhen Cao <[e-mail]>
>>>>>> wrote:
>>>>>>>
>>>>>>> Hello everyone,
>>>>>>>
>>>>>>> This email starts the WGLC for draft-ietf-lwig-crypto-sensors-02
>>>>>>> (https://tools.ietf.org/html/draft-ietf-lwig-crypto-sensors-02)
>>>>>>>
>>>>>>> Could you help review the document and send your comments to the
>>>>>>> mailing list. Thank you in advance.
>>>>>>>
>>>>>>> The WGLC will end in two weeks from now.
>>>>>>>
>>>>>>> BR,
>>>>>>> Zhen
>>>>>>
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