Watch How a Hacker’s Infrared Laser Can Spy on Your Laptop’s Keystrokes

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Watch How a Hacker’s Infrared Laser Can Spy on Your Laptop’s Keystrokes - Wired

Quick Summary:

To reduce the noise created by ambient light when attempting to detect vibrations in his reflected infrared laser, for instance, he designed his laser microphone system to strobe on and off 400,000 times per second, picking up the reflected light through a lens so that the light hits a photo diode—or doesn't—depending on the target's vibrations.

Of course, given that laser microphones have existed for decades, Kamkar admits he doesn't know what advancements the technology may have made in commercial implementations available to governments or law enforcement, not to mention even more secret, custom-built technologies potentially created or used by intelligence agencies.“I would assume they're doing this or something like it,” Kamkar says.

For his keystroke detection technique, Kamkar then fed the output of his laser microphone into an audio program called iZotopeRX to further remove noise and then an open source piece of software called Keytap3 that can convert the sound of keystrokes into legible text.