https://www.newsbreakapp.com/n/0MbloCip?s=a3&pd=02h1yVjC

Hackers can tell what people are typing just by listening through a smartphone's microphone

Daily Mail




Hackers could be able to tell what you are typing on your computer just by listening to your keystrokes through your smartphone's microphone, a new study warns.

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Jim Bell's comment:
Peter Wright's 1970's book, Spycatcher, described an early, primitive version of this technology.