11 Replies to “Are you sure you want better WiFi?”

  1. Technically WiFi is microwave, not radiowave. I know people do not care but at 2-5 GHz you are into a different form of physics – reflection and not diffusion.
    When radar was first introduced in the late 1930s the frequency was 10-30 MHz or 10 meter wavelength. Such wavelengths could not define fingers moving over keyboards.
    Todays WiFi operates at 2-5 GHz or 10 cm. Still too long for keyboard analysis.
    As you increase the frequency, the wavelength decreases and the ability to detect smaller objects increases. Unfortunately these smaller wavelengths need line of sight because they are easily reflected. They would not penetrate a tin-foil hat, for example. Bad example.

  3. Steve, they are talking frequency distortion, or ambient disturbance, similar to how they detect deep sea subs from space. It is the method they do, or will use to detect “stealth” air craft. Every “movement” in a medium causes a disturbance, and that disturbance can be detected

  7. Listening in on computers was considered a problem even 30 years ago.
    Monitors were notoriously noisy and it was possible determine what was being displayed from the signals that were emitted. Devices like that were often poorly shielded, often deliberately, in order to make them cheaper.
    One solution to that was this:
    https://en.wikipedia.org/wiki/Tempest_%28codename%29

  9. There are always counter measures that can be deployed – get too clever … someone will figure out how to get cleverer.

  11. On the bright side, it looks as if the article was lifted from the “Atlantic” so it’s rubbish anyway.

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