[lp-wan] SCHC over LoRaWAN - IID algorithm

[Olivier Gimenez <[e-mail]>]

Hello working group,

I did not got any feedback on the following proposition related to the IID computation algorithm, which is currently mandatory to implement and to use, and we want some implementations to be able to use something else if they need. Any thoughts ?

Thank you
Olivier

From: Olivier Gimenez
Sent: 03 November 2020 19:05
To: 'Erik Kline' <[e-mail]>; The IESG <[e-mail]>; [e-mail]
Cc: [e-mail]; [e-mail]; Dominique Barthel <[e-mail]>
Subject: RE: Erik Kline's No Objection on draft-ietf-lpwan-schc-over-lorawan-13: (with COMMENT)


Hi Erik,



Thank you for your review, your comment raised some discussions during today's lpwan interim:

First thoughts: it cannot be changed because we want to use the same IID on the device and the gateway, but if it is respected we might be less restrictive as long as all implementation include at least the algorithm written in the draft. So I propose the following changes:



In order to mitigate the risks described in [RFC8064] and [RFC8065], implementation MUST implement the following algorithm and SHOULD use it.



   1.  key = LoRaWAN AppSKey



[...]



   out of scope of this document and left to the implementation.



Note: Implementation also using another IID source MUST have same IID value on both device and SCHC gateway.



> -----Original Message-----

> From: Erik Kline via Datatracker <[e-mail]<mailto:[e-mail]>>

> Sent: 03 November 2020 06:26

> To: The IESG <[e-mail]<mailto:[e-mail]>>

> Cc: [e-mail]<mailto:[e-mail]>; [e-mail]<mailto:[e-mail]>; lp-

> [e-mail]<mailto:[e-mail]>; Dominique Barthel <[e-mail]<mailto:[e-mail]>>;

> [e-mail]<mailto:[e-mail]>

> Subject: Erik Kline's No Objection on draft-ietf-lpwan-schc-over-lorawan-13:

> (with COMMENT)

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> draft-ietf-lpwan-schc-over-lorawan-13: No Objection

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> ----------------------------------------------------------------------

> COMMENT:

> ----------------------------------------------------------------------

>

> [[ questions ]]

>

> [ section 5.3 ]

>

> * Is this MUST really necessary?  If an implementation wanted to, say, read

>   8 bytes from a good /dev/urandom source wouldn't that also be okay?  Seems

>   like SHOULD would suffice (with a MUST NOT comment about not just using

>   DevEUI etc).

>

>



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