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This feels like one of those things that’s kind of a confirmation of existing common knowledge. If you have dogs, you are probably very aware that dogs know certain words and develop expectations around routinely used words and actions. For example, running through a list of words my dogs know and gauging their reactions will tell me exactly what they want nine times out of ten.
Dog boops. “Food?” … “Water?” … “Outside?” Tilt “You want outside?” Dogs stampede to door
It’s kind of wild how much they understand of vocabulary, but add in the way they read faces and body language, it’s frankly amazing.
Source: I’ve been an embedded sw engineer for 10+ years
This seems like a pretty decent resource generally speaking. I’ll add this caveat though.
If your threat model includes anyone with large state level resources, you should stay very far away from anything with a radio in it. Wifi, Bluetooth, NFC, whatever, it doesn’t matter. It is possible for it to be compromised at a silicon level, which means you can never be sure it is fully secure.
You have to assume that anything transmitted via RF of any type is capable of being collected and compromised.
All that said, if your concern actually does include people with black helicopters, you already know this, and if it doesn’t, just remember that these technologies are getting cheaper and more ubiquitous all the time (see stingray), so be careful.