Hi All,
Just wondering whether this possible exploit had hit the radar at Mycroft yet - https://lightcommands.com/.
Paper:- https://lightcommands.com/20191104-Light-Commands.pdf
Cheers,
Brian
Hadn’t seen this, thanks for posting it 
Here’s another general link for anyone else interested.
We have talked about various authentication mechanisms that would mitigate this type of attack to a degree. Speaker identification would certainly make it harder in that the attackers need to craft the data transmitted to imitate a specific individual. Or pairing a hardware device that you keep with you like your phone could also be used to restrict voice commands to when that device is in range.
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Wow. That is one interesting read.