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"Let's say you have an IoT device that is well protected with functions that can be accessed through a well-defined API; even if you can control the device through the API, you probably can't do too much harm. Firmware, the programming inside the device has logical constraints that don't allow you, for example, to close garage doors while someone is in the way of them or overheat a device so that it combusts.  We used to trust that hardware, such as a common kitchen appliance, could be trusted and could not be easily altered without physically dismounting the device. But with today's "smart" appliances, this is no longer the case."