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Re: [Secdispatch] EDHOC Summary

John Mattsson <john.mattsson@ericsson.com> Wed, 10 April 2019 06:59 UTC

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From: John Mattsson <john.mattsson@ericsson.com>
To: Christopher Wood <caw@heapingbits.net>, "secdispatch@ietf.org" <secdispatch@ietf.org>
Thread-Topic: [Secdispatch] EDHOC Summary
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Date: Wed, 10 Apr 2019 06:59:08 +0000
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Subject: Re: [Secdispatch] EDHOC Summary
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Hi Chris,

Christopher Wood <caw@heapingbits.net> wrote:

>If what’s missing is a lightweight AKE protocol, then shouldn’t the purpose of this WG be to first identify what >lightweight means? To reiterate (my understanding of) Martin’s point, it seems the requirements do not have >consensus, and therefore choosing a specific AKE is a bit premature. It seems prudent to first get a shared >understanding of the problem space and requirements before we trim the solution space.
 
The use cases and requirements for lightweight protocols including lightweight security protocols for constrained IoT have been discussed for years in the IETF IoT working groups (CORE, ACE, T2TRG, 6TiSCH, LWIG, LPWAN, 6lo, etc.). IESG took the decision a few year ago that IETF WGs should in general not do requirement and use case RFCs. RFC7228 (and RFC7228bis) gives an excellent overview of the wide span of IoT devices and networks and how utterly constrained some of them are. For the target network technologies LPWAN over LoRaWAN and 6TiSCH over IEEE 802.15.4, the requirements for message size are clear (under 50 bytes).

Cheers,
John

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