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Re:How a Gift from Schoolchildren Let the Soviets Spy on the... by pratheekrebala on Sunday November 06, 2016 @12:11PM (#12886020)
Michael Ossmann gave a great talk at DEFCON on RF Retro-reflectors. Provides a good technical overview of the approach they used here.

Starts at 3:32 -- https://youtu.be/mAai6dRAtFo?t=212

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