IoT security is as multilayered as IoT implementations themselves. See the matter from an attacker’s viewpoint and the reason is obvious: if devices are secure but the network is weak, they’ll gain control of the devices via the network. If both are solid but the applications that manage or control them are poorly-protected, that’s their in. It’s a case of one building, several doors. And for attackers, IoT is a huge opportunity: all that computing power, great for productivity, if only we could access it.