Wi-Fi signals could prove useful for spies
A router’s emissions can paint a picture of activity in a room
Like all radio waves, Wi-Fi signals undergo subtle shifts when they encounter objects—human beings included. These can reveal information about the shape and motion of what has been encountered, in a manner akin to the way a bat’s chirps reveal obstacles and prey.
This article appeared in the Science & technology section of the print edition under the headline “I spy, with my ⇔little Wi-Fi”
From the January 28th 2023 edition
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