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PaperclipPerfector  6mo ago (text post)   24829 thread views

Culture War Roundup for the week of May 6, 2024

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CMOS RAM

Fair enough. Hopefully the worst case is that this ends up not being covered, even though it should be.

5.4-2 (unique IDs)

I think I can agree that there may be tradeoffs here for some devices.

twenty sensors on a LIN line

I think these would almost certainly just be classified as "constrained devices", and they also give alternate mechanisms for valid trust relations, which I think will be what the automakers go for. They'll do the verification at a different step and say that the lack of physical or other access is what ensures that presence on the network is sufficient.

A presumption toward encrypting everything makes sense when it's free or nearly-free, but there are a lot of entire devices where it's just not that relevant. If your equipment does literally nothing but relay temperature and humidity values over ISM bands, you might want some amount of authentication to prevent spoofing, but it's really not that big a deal if someone can listen in. And there's a lot of IoT stuff that goes into that category.

There's some parts of the rules that motion around this -- 5.5-1's "Appropriateness of security controls and the use of best practice cryptography is dependent on many factors including the usage context" or the exceptions for ARP, DHCP, DNS, ICMP, and NTP in 5.5-5 -- but again that turns the requirement into aspirational text.

I think you're right that some portion of this is aspirational text, but I think it's along the lines of, "If you can just put some reason down on the table for why this should be considered aspirational text, then you're probably fine," and the only people who are at risk are the people who are doing the clearly and obviously boneheaded stuff. Like, I don't think it's going to be hard for the maker of a device that does nothing but relay temperature and humidity values over ISM bands to just say, "It's a constrained device; can't do any of that fancy stuff; pretty much no way in anyway," and we can all mostly go home happy. If we start having major corporate networks brought down by botnets of temperature monitors (uh, how?), then perhaps folks will have to figure out how to make it more than aspirational text.

In any event, thanks a bunch for really thinking through edge cases for a wide variety of really specialized and, for lack of a better term, really constrained devices.

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