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  • Another strategy that's often used is to cause motion then detect the resulting transmission spike. That's also defeatable of course (cache+burst, CBR, etc).

    The ideal detector should incorporate multiple methods. Someone should make a site that rates these for each detection method then adds them into an overall score.

    by gruntled-worker
  • I wonder if it works with smart glasses.
    by brunoborges
  • Are hidden cameras in hotel rooms such a concern that normal citizens need to be concerned with it?
    by hellweaver666
  • If this worked with IR, and so non visible, it might be even more useful.

    Great idea though.

    by fidotron
  • Next thing, hotels will use "microlens wallpaper", so the device becomes practically useless.

    See also: https://en.wikipedia.org/wiki/Nonlinear_junction_detector#Co...

    by amelius
  • Until someone develops hidden cameras with AI that will be auto turned on couple of hours later after detecting presence at that time a scan was already performed and nothing was found.....
    by carlostkd
  • The overall article and discussion here is detection, and all the weaknesses of detection.

    At some point, the only solution will be active destruction. Someone will build something like a multi-wavelength high powered laser device to sweep the room. Arrive, setup the device near the center of the space, set the Start-Timer, leave, return in 3min confident and optical detectors are well fried. I hope it doesn't come to that, but...

    by toss1
  • People normally do this by scanning a 10mW 832nm laser with a mirror, according to Dan Gelbart in https://www.youtube.com/watch?v=0MtRxX0crjU. The lecture is 77 minutes, covering nonlinear junction detectors, digital calipers, the US-embassy bug in Russia, laser microphones bounced off windows, and geometric errors from material relaxation. The bit about camera detectors is close to the end. Works for eyeballs too.

    Lensless sensors (for example, using compressed sensing, or Hadamard shadow masks) can presumably defeat this, but also, watching from far enough away should defeat it. Hard to do that inside a pervert's AirBNB, though.

    by kragen

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