5 ms·
No sensitive work should ever be done in a place with glass windows. https://en.wikipedia.org/wiki/Laser_microphone https://en.wikipedia.org/wiki/Laser_micropho
by tniemi 8y ago
No sensitive work should ever be done in a place with glass windows.
https://en.wikipedia.org/wiki/Laser_microphone https://en.wikipedia.org/wiki/Laser_microphone
- rl3 8y agoOr you just pump rock music in between the panes of glass.
- jacquesm 8y agoTake the same music, invert phase, add to original: sound recovered. Very loud white noise would be a lot more effective.
- kuschku 8y agoTake rock music, played by a $0.20 shitty chinese speaker. Indistinguishable from white noise.
- eeZah7Ux 8y agoActually a shitty speaker makes it even easier to filter out by producing a smaller spectrum. You need real white noise - not very loud, but it has to be random as in not predictable.
- rl3 8y agoYou don't actually: https://www.npr.org/templates/story/story.php?storyId=95689436 https://www.npr.org/templates/story/story.php?storyId=956894... "And to prevent sophisticated laser devices from capturing the telltale vibration of his voice on the glass, music played between the panes."
- anfractuosity 8y agoBut then they can film your plants/crisp packets instead to pickup audio - https://people.csail.mit.edu/mrub/VisualMic/ https://people.csail.mit.edu/mrub/VisualMic/
- rl3 8y agoI can only imagine the lens required to do this from a distance. They'd need a telescope. Then you'd have to account for stuff like building sway.
- saagarjha 8y agoIs this practical? I'd expect that temperature gradients and moisture in the air have an effect on the distance the laser light has to travel; are the changes caused by vibration significantly larger?
- SiempreViernes 8y agoI guess the primary reason it works is because the factors you mention vary significantly slower than the vibrations from speech.
- austinh100 8y agoLaser microphones can be mitigated by vibrating the glass at the frequency of human speech. https://www.shomer-tec.com/laser-surveillance-defeater.html https://www.shomer-tec.com/laser-surveillance-defeater.html
- ShorsHammer 8y agoMitigating it seems like a last resort when there's no other option. With researchers like Mordechai Guri out there, I'd say the GP comment is solid general advice. https://cyber.bgu.ac.il//advanced-cyber/airgap https://cyber.bgu.ac.il//advanced-cyber/airgap https://youtu.be/4vIu8ld68fc https://youtu.be/4vIu8ld68fc
- subcosmos 8y agoId imagine that rigging the windows with piezoelectric transducers, and vibrating them with FAKE office chatter, would be an even more effective solution.
- nabla9 8y agoHas anyone tried to make passive listening device based on laser reading? Take small microphone element that captures human speaking range vibrators and connect it to equally small retroreflector. Then you can read the sound from any angle using laser/sensor next to each other. There would be no electrical or radio frequency transmissions at all.
- dgacmu 8y agoDo those work with modern multi-pane windows?
- walrus01 8y agoSCIFs don't have windows.