Hi Stevie,
"Beck, Stefan" <s.b...@osram.com> writes:
> Hi Derek,
>
> The requirement roughly is:
> Assume a few light switches as multicasters and many luminaires as listeners
> - turning lights on / off via multicast
> The end-2-end processing (multicaster to encrypt&sign the message, the
> network to transmit the message, and the listeners to validate&decrypt the
> message) should not exceed ~200 ms.
>
> Stevie
Thanks, that's a good start. A few follow-on questions:
What's the realistic transmission speed you can expect? 100kbps?
1mbps? 10kbps?
What's the realistic processing power / platform of the switches and
liminaires? (base processor / clock speed)
I'm asking because I do have access to a lightweight signature scheme
where we can validate a 128-bit-security-level signature on an ARM
Cortex M3 in 5.7ms (@48MHz).
I'll also note that in this scenario encryption is a "nice to have" but
does not seem "necessary", whereas integrity protection and source
authentication is definitely necessary. I.e., if it's a trade-off
between encryption and authentication/integrity I would choose
authentication/integrity.
Just my $0.02.
-derek
--
Derek Atkins 617-623-3745
de...@ihtfp.com www.ihtfp.com
Computer and Internet Security Consultant
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