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[core] OSCORE Header Compression

Göran Selander <goran.selander@ericsson.com> Wed, 14 March 2018 14:38 UTC

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From: Göran Selander <goran.selander@ericsson.com>
To: "core@ietf.org" <core@ietf.org>
Thread-Topic: OSCORE Header Compression
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Date: Wed, 14 Mar 2018 14:37:57 +0000
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Subject: [core] OSCORE Header Compression
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All,

Another IESG review comment, see below. We certainly have discussed
message size optimisations on the CORE list, but I couldn’t recall if this
particular optimization was discussed so I forward the comment:

- Do you agree that this optimisation matters?

https://core-wg.github.io/oscoap/draft-ietf-core-object-security.html#rfc.s
ection.6


(As a comparison, DTLS 1.3 introduces a short header to save of the order
of 5 bytes.)

Regards,
Göran


On 2018-03-08 08:38, "Adam Roach" <adam@nostrum.com> wrote:

>
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>
>§6 and its subsections:
>
>The use of a bespoke profile of COSE adds implementation complexity to
>ostenstibly resource-limited device for what appears to be very little
>gain. In
>the examples given, savings of 4 to 7 bytes are demonstrated, which seems
>to
>hardly warrant the addition of this mechanism. These do not appear to be
>degenerate cases, so I can't imagine that compression performance under
>real-world conditions would be much better.  Was there an explicit
>discussion
>in the working group regarding this complexity/wire-size trade-off?
>
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