Can a bulb leaks your conversation?

How You Can Use a Light Bulb to Eavesdrop on People's Conversations ?

Researchers from Israeli's Ben-Gurion University of the Negev and the Weizmann Institute of Science today revealed a new technique for long-distance eavesdropping they call "lamphone."

Eavesdropping is the act of secretly or stealthily listening to the private conversation or communications of others without their consent.” – As per Wikipedia.

The sophisticated technology of eavesdropping has shown much advancement in this field which includes wireless communications, emails and many other techniques to achieve eavesdropping. But the weird thing is - “can a light bulb contribute to eavesdropping

The simple answer is “Yes” as per researchers and scientist at Ben-Gurion University, Israel, they have achieved the milestone. 
can a light bulb contribute to eavesdropping
can a light bulb contribute to eavesdropping.

The Scientists at the Ben-Gurion University in Israel have said it is possible to recover full conversations from the vibration patterns in a light bulb. The hanging bulb acts as both a diaphragm (sound waves cascade across its surface) and transducer (it converts air pressure from sound to small changes in light), which means it could be a useful gadget for secret agents and nosy people everywhere.
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As per scientist’s of university “We show how fluctuations in the air pressure on the surface of the hanging bulb (in response to sound), which cause the bulb to vibrate very slightly (a milli-degree vibration), can be exploited by eavesdroppers to recover speech and singing, passively, externally, and in real time," the researchers write in their paper, which they plan to present later this year at the Black Hat USA security conference. They also states that they conceived the idea from some of the same minds behind a Tesla Autopilot hack from earlier this year, which proved a simple projector, could fool the computer vision system into slowing down or speeding up for fake pedestrians and speed limit signs.


To test their device, the researchers set up shop on a pedestrian bridge about 100 meters away from a third-floor office inside a commercial building. Inside, their target was a simple 12-Watt LED Light Bulb. Their goal was to recover speech and music from the room without ever entering or being able to hear any sounds from the setup point.

In this experiment they used three different telescopes with various lens with different diameters and mounted an electro-optical sensor to each telescope lens, one at a time. Through an analog-to-digital converter, the researchers obtained information about the vibrations in the light bulb, and then processed it through a custom algorithm.

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 each telescope. 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. In their tests, the researchers used a hanging bulb, and it's not clear if a bulb mounted in a fixed lamp or a ceiling fixture would vibrate enough to derive the same sort of audio signal.

If the technology gets the success then this can be the turning point in field of spying, secret missions and military.

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