Shulou(Shulou.com)11/24 Report--

CTOnews.com, June 19, the research team from Ben Gurion University in the Negev and the Weizmann Institute of Science in Israel recently published a paper claiming that the vibration of the light bulb in the target's room was successfully used to reproduce the voice of the network meeting clearly from 35 meters away.

▲ Image Source Research team Paper this team introduces that this technology is called "Lamphone attack". First, it needs a telescope to focus on the light bulb in the room where the target is located (the commonly used table lamp bulb), and then use the photoelectric sensor installed on the telescope to "decipher" the collected vibration images. This photoelectric sensor is essentially a photodiode that converts light signals into electrical signals.

The electrical signals obtained by the telescope of the ▲ image source research team will eventually enter the acoustic recovery system. Through this system, the electrical signal is converted into digital signal, and the audio signal is separated. Finally, the data is processed by the acoustic reconstruction algorithm running on the notebook computer.

The key to this kind of eavesdropping is that the conversation in the target room will produce sound waves, which will cause the change of the pressure on the surface of the bulb and then cause the bulb to vibrate. The eavesdropper can effectively realize the acquisition, separation and reconstruction of the acoustic signal by capturing the change of light intensity caused by the light bulb vibration through the telescope.

The team said that this attack method has been evaluated and verified in a wide range of experiments, and it can reproduce network conference-level sound in good clarity through a desktop lamp at a distance of 35 meters.

CTOnews.com enclose the address of the paper: click here to

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