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Re: [CFRG] RGLC on draft-irtf-cfrg-dnhpke-03

Martin Thomson <mt@lowentropy.net> Fri, 08 December 2023 12:02 UTC

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Date: Fri, 08 Dec 2023 23:02:33 +1100
From: Martin Thomson <mt@lowentropy.net>
To: cfrg@irtf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/cfrg/UPryUWCelLkvuyXWy_dnC5VEhm8>
Subject: Re: [CFRG] RGLC on draft-irtf-cfrg-dnhpke-03
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On Fri, Dec 8, 2023, at 20:23, Ilari Liusvaara wrote:
> On Thu, Dec 07, 2023 at 05:42:56PM -0500, Richard Barnes wrote:
>> As a final note, I would just point out that the even document's
>> putative justification for DAE is false.  It is perfectly possible
>> to use HPKE in lossy networks.
>
> AFAICT, not without heavy, in many cases not acceptable, overhead.

The basic packet protection design of DTLS and QUIC would work with HPKE as the protection layer.  The overhead for a counter is low and anti-replay costs very little, both scaling in cost with the amount of reordering you need to tolerate.

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