Eavesdropping on Phone Taps from Voice Assistants
Schneier on Security
DECEMBER 22, 2020
The microphones on voice assistants are very sensitive, and can snoop on all sorts of data : In Hey Alexa what did I just type? we show that when sitting up to half a meter away, a voice assistant can still hear the taps you make on your phone, even in presence of noise. Modern voice assistants have two to seven microphones, so they can do directional localisation, just as human ears do, but with greater sensitivity.
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