I was takling about PIN by SMS, as you then need to intersept the SMS as well. Possible but way more difficult.
Define reachable. Of course, physically separated from the internet would be preferable, but then you need a completely separate means to communicate if necessary.If that computer is reachable by the general internet (or even a semi-public corporate intranet) then you're doing it wrong. Period.
I certainly wouldn't like to do live Kernel patching on a safety relevant system. That update process would be a little bit more complicated.Plus, you'd use a completely different OS architecture which allows you to patch anything while the processes are running. Ever heard of "No Reboot Kernel Patching"?



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