On the other hand, I’d argue that it’s close enough to trivial to be considered trivial. How many embedded devices transmit sensitive information?

Now, I know that pretty much every Bluetooth based credit card reading device explicitly defends against a channel such as this, but there are tons of access control solutions, and medical devices that don’t

Would you notice a raspberry pi tucked into the mess of wires beneath the security guard guards desk?

> How many embedded devices transmit sensitive information?

Every Zigbee device uses AES keys to secure the network, although the security of the protocol is pretty weak in most deployments, especially when new devices join the network. Leaking the network key would provide access to the entire network. The ARM Cortex-M4 is often used, which the side-channel attack in the article is about.