Neil wrote:
> Given that one of the primary motivators of HPKE is use of post-quantum KEMs,
> I’d have thought the length of the algorithm identifiers was the least of the
> size issues.
I’ll note that none of the HPKE algorithm identified being registered use
post-quantum KEMs. That could happen in other specs that build on this one in
the future, but the mission of this spec is to document how to use existing
HPKE algorithms with JOSE.
-- Mike
From: Orie Steele <[email protected]>
Sent: Friday, December 6, 2024 6:27 AM
To: Neil Madden <[email protected]>
Cc: Michael Jones <[email protected]>; [email protected]; cose
<[email protected]>
Subject: Re: [jose] Re: JOSE HPKE algorithm identifiers
Adding COSE list to say... These labels will show up in the COSE registry as
well, but their length will not be an issue, since the assigned integer will be
used instead.
I'm supportive of shorter registered names if we can land them.
From RFC7518 - https://datatracker.ietf.org/doc/html/rfc7518#section-1
"Names defined by this specification are short because a core goal is for the
resulting representations to be compact."
Later in, in the registration template:
https://datatracker.ietf.org/doc/html/rfc7518#section-7.3.1
"Because a core goal of this specification is for the resulting representations
to be compact, it is RECOMMENDED that the name be short -- not to exceed 8
characters without a compelling reason to do so."
OS
On Fri, Dec 6, 2024 at 2:15 AM Neil Madden
<[email protected]<mailto:[email protected]>> wrote:
On 5 Dec 2024, at 20:15, Michael Jones
<[email protected]<mailto:[email protected]>> wrote:
Please see the discussion in the issue
https://github.com/ietf-wg-jose/draft-ietf-jose-hpke-encrypt/issues/8
(Algorithm identifiers like HPKE-P256-SHA256-A128GCM are overly verbose) and
add your thoughts there.
Given that one of the primary motivators of HPKE is use of post-quantum KEMs,
I’d have thought the length of the algorithm identifiers was the least of the
size issues. Even the smallest ML-KEM ciphertexts are over 1KB when
base64-encoded. A few bytes for an algorithm identifier seems neither here nor
there.
— Neil
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ORIE STEELE
Chief Technology Officer
www.transmute.industries<http://www.transmute.industries/>
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