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    What makes known devices "known"? It stores their ID or something? Can't that be faked too? Commented Dec 20, 2017 at 11:01
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    Known devices are matched using a rich condition language, you can be as specific as you want (including USB serial number, insertion port...). Anything can be faked, but if you’re up against an adversary that’s figuring out what you’ve whitelisted, you’ve probably lost anyway. (You can of course never whitelist anything apart from your keyboard if you really want to play it safe.) Commented Dec 20, 2017 at 12:03
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    Emphasis on your keyboard, not "any USB keyboard". Commented Dec 21, 2017 at 9:03
  • @StephenKitt, Would PS/2 keyboard be even more safe to whitelist than USB one t? ;-) Commented Dec 29, 2021 at 2:50