The researchers used a telescope to collect the light reflected from an object near the speaker and a light sensor — a photodiode — to sample the changes in the light as the object vibrated. "Many shiny, lightweight objects can serve as optical implants that can be exploited to recover speech," he said. The eavesdropping experiment is not the first time that researchers have attempted side-channel attacks that pick up audio from surrounding objects. Great Seal, Little Seal and BeyondThe Little Seal Bug is a nod to a well-known early espionage incident, known as the Great Seal Bug. Similarly, the Little Seal Bug could use common items around an office to capture audio via reflected light.

Source: The Star May 14, 2022 14:54 UTC