A more recent update. May 2018:
https://www.nytimes.com/2018/05/10/technology/alexa-siri-hidden-command-audio-attacks.html
Such a simple idea: Sound a machine can hear but humans cannot.
Update info 10 Jan 2018: https://www.wired.com/story/when-wifi-wont-work-let-sound-carry-your-data/
https://www.chirp.io/#what-is-chirp
Fascinating technology. Audio frequency rather than radio frequency transmission. It can be an audio frequency beyond the range of human hearing. In a recent blog entry I looked into this.
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