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------------ 2759 - SPYING - an ease dropping light bulb?
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- Spies watching from a distant view through a window can use a laptop computer, a telescope, and a $400 electro-optical sensor to record the sounds inside. The spy can listen in on any sounds in the room that's hundreds of feet away in real-time. It is done by simply observing the minuscule vibrations those sounds create on the glass surface of a light bulb inside.
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- By measuring the tiny changes in light output from the bulb that those vibrations cause, a spy can pick up sound clearly enough to discern the contents of conversations or even recognize a piece of music.
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- Demonstrations have placed a series of telescopes 80 feet away from a target office's light bulb, and a put telescope's eyepiece in front of a electro-optical sensor. They then used an analog-to-digital converter to convert the electrical signals from that sensor to digital information.
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- They played music and speech recordings in this faraway room, they fed the information picked up by their set-up to a laptop, which analyzed the readings. The researchers found that the tiny vibrations of the light bulb in response to sound, movements that they measured at as little as a few hundred microns, registered as measurable changes in the light their sensor picked up through the telescope.
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- After processing the signal through software to filter out noise, they were able to reconstruct recordings of the sounds inside the room with remarkable fidelity: The demonstration showed that they could reproduce an audible snippet of a speech from President Donald Trump.
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- They also generated a recording of the Beatles' "Let It Be" clear enough that a “name-that-tune app” could instantly recognize it.
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- Spy researchers have known for years that a laser bounced off a target's window can allow spies to pick up the sounds inside. In 2014 they demonstrated that the gyroscope of a compromised smartphone can pick up sounds even if the malware can't access its microphone.
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- Researchers have demonstrated using a "visual microphone". By analyzing video recorded via telescope of an object in a room that picks up vibrations in a bag of potato chips or a houseplant, they were able to reconstruct speech and music.
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- For the paranoid among us cover any hanging bulbs, close the curtains, use anti-vibration devices on windows to prevent eavesdropping with a laser microphone. And, sweep the house for bugs. Remove the microphones from your phone and computer.
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- Don’t forget the light bulbs. Even the light bulbs have ears. A paranoiac's work is never done. What next?
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- June 13, 2020 2759
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--------------------- Saturday, June 13, 2020 -------------------------
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