[6tsch] (my comments) Re: Security slides

[Rene Struik <[e-mail]>]

Hi Yoshi:

I am not sure why ZigBee IP is mentioned on the slides, since ZigBee 
does not use TSCH. If mentioning a potential "user" at all, it seems 
more appropriate to mention w/HART or ISA SP100. (It is quite likely not 
needed, though, since covered elsewhere on general overview slides.)

Why not using the 802.15.4e specification as basis for security slides? 
Section 5.1.2.6 describes PAN formation. It would also help to have a 
few words on "basic" security features of 802.15.4, so that people get 
an idea what is in there.

802.15.4e nodes use time-scheduling info to determine when to 
communicate (time scheduling) and on which communication channel 
(channel hopping). The 802.15.4e specification describes how this is 
done, based on available TSCH parameters, but does not describe how 
these TSCH parameters are set. That is where some of the work comes in, 
also for security.

I edited the slides you sent out for review, so as to reflect the above 
(please see attached). BTW - I did not delve into PAN formation as 
hinted at in 802.15.4e.

As you can see, I suggest partitioning security work in two stages, 
where the second stage is conditional on rechartering. More importantly, 
though, I feel one needs to focus on understanding the space (and the 
"hooks" in 802.15.4e) first, before putting "solutions" on the table. In 
other words, first define the problem on which these solutions should be 
based.

One interesting problem would be how to use 802.15.4e security, after a 
joining operation, but prior to getting a reliable Absolute Slot Number...

We can discuss more on the call tomorrow.

Best regards, Rene

On 7/24/2013 6:05 PM, [e-mail] wrote:
>
> Security slides are available at:
>
> https://bitbucket.org/6tsch/meetings/src/master/130730_ietf-87_berlin/3f_draft-ohba-6tsch-security.pptx
>
> Please review and send your feedback.
>
> Regards,
>
> Yoshihiro Ohba
>
>
>
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