Classic information security is a triad: confidentiality, integrity, and availability. You'll see it called "CIA," which admittedly is confusing in the context of national security. But basically, the three things I can do with your data are steal it (confidentiality), modify it (integrity), or prevent you from getting it (availability).
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On the Internet of Things, integrity and availability threats are much worse than confidentiality threats. It's one thing if your smart door lock can be eavesdropped upon to know who is home. It's another thing entirely if it can be hacked to allow a burglar to open the door -- or prevent you from opening your door. A hacker who can deny you control of your car, or take over control, is much more dangerous than one who can eavesdrop on your conversations or track your car's location.
With the advent of the Internet of Things and cyber-physical systems in general, we've given the Internethands and feet: the ability to directly affect the physical world. What used to be attacks against data and information have become attacks against flesh, steel, and concrete.
Today's threats include hackers crashingairplanes by hacking into computer networks, and remotely disabling cars, either when they're turned off and parked or while they're speeding down the highway. We're worried about manipulated counts from electronic voting machines, frozen water pipes through
