Rushing toward an Internet of Things, we are rapidly approaching a world in which every inhabited space contains at least one internet-connected microphone, in the form of smartphones, smart TVs, voice-controlled assistant devices, baby monitors, and even children’s toys that use cloud-based speech recognition. Many of these devices have a terrible security record [95]. Even the most totalitarian and repressive regimes could only dream of putting a microphone in every room and forcing every person to constantly carry a device capable of tracking their location and movements. Yet we apparently
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