Is your digital assistant taking orders behind your back? Scientists from China's Zheijiang University have proved it's possible, publishing new research that demonstrates how Siri, Alexa, and other voice-activated programs can be controlled using inaudible ultrasound commands.
"Secret messages for Alexa and Co.
Researchers can hide secret commands for voice assistants in spoken sentences, birds' twittering, or music. They are not audible to the human ear. The machine recognises them precisely."
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