Re: [COSE] COSE HPKE Public Key Format Consensus Call

Thanks for initiating the consensus call.

> 3.  Other (please describe in sufficient detail to enable its
specification)

+1 to my proposal described in my previous post[1].

I have made a chart comparing my proposal to the current draft. As
described in the chart, there are some problems with the current draft that
cannot be overlooked. I would be happy if you could use it as a reference
for your vote.
https://docs.google.com/presentation/d/1azfHu93NCm5M9KUbpbtRze7aitvpBAj9SxhpvHe877M

In addition,  Mr. Richard Barnes also pointed out on the JOSE WG mailing
list that it is incorrect to use COSE_Key to represent encapsulated
keys[2]. I have the same opinion.

As I mentioned repeatedly,  the encoding format of the recipient public key
and the encapsulated key (ephemeral sender's public key) should be
considered separately.
The former should be able to be expressed with COSE_Key, but the latter
should not.

Best regards,
Daisuke

[1] https://mailarchive.ietf.org/arch/msg/cose/ZY5v7jJr4SxHGIbeA3dgLC6eZDg/
[2] https://mailarchive.ietf.org/arch/msg/jose/IKIR_XusfHD26ewqZSt5ad2WUc8/

2022年9月23日(金) 2:09 Mike Jones <Michael.Jones=40microsoft.com@dmarc.ietf.org
>:

> As discussed at IETF 114, the HPKE draft uses the COSE_Key public key
> representation.  The authors described that Ilari Liusvaara had proposed
> using a different public key representation, which is detailed in Slide 2
> of
> https://datatracker.ietf.org/meeting/114/materials/slides-114-cose-cose-hpke-00.
> As recorded in the minutes
> <https://datatracker.ietf.org/doc/minutes-114-cose/>, consensus during
> the meeting appeared to be in favor of continuing to use COSE_Key.
>
>
>
> This note initiates a consensus call by the chairs on the topic of what
> public key format the COSE HPKE specification will use.  Working group
> members are requested to express their preferences within two weeks of this
> note (by Thursday, September 6th) for either:
>
>
>
> 1.  Continuing to use COSE_Key
>
> 2.  Using the different format proposed by Ilari Liusvaara
>
> 3.  Other (please describe in sufficient detail to enable its
> specification)
>
>
>
>                                                        Thank you,
>
>                                          -- Mike (for the COSE chairs)
>
>
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