Thanks for the quick response, Carsten.

Using "HPKE-v1-BASE" is fine for me.

Ciao
Hannes

-----Original Message-----
From: Carsten Bormann <[email protected]>
Sent: Friday, December 9, 2022 12:45 PM
To: Hannes Tschofenig <[email protected]>
Cc: [email protected]
Subject: Re: [COSE] HPKE versions

On 9. Dec 2022, at 12:17, Hannes Tschofenig <[email protected]> wrote:
>
> I am OK with registering “HPKEv1-BASE” as the algorithm id since I don’t see 
> much difference to the currently proposed “HPKE”.

While HPKE doesn’t actually seem to have versions, I would be OK with this, as 
it makes it quite clear that we do not need to jam any revision of HPKE into 
the same algorithm-ID (*).

(Note that the “version-label” that is used in used in LabeledExtract() and 
LabeledExpand() but not otherwise defined in RFC 9180 is "HPKE-v1”, so we 
probably should keep that second dash in there, even if it actually is just 
human-readable information in the registry.)

Grüße, Carsten

(*) well, unless we want to make a forward-compatible (**) revision work with 
old systems.  But we can cross that bridge if we ever get to it.

(**)
* Backward compatibility = old data, new system.
* Forward compatibility = new data, old system.

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