How hackers use power LEDs to spy on conversations 100 feet away:
To pull off this privacy-busting attack 'simply' requires the use of an electro-optical sensor attached to a telescope. Once this is pointed at the target power LED, from distances of up to 100 feet away, the optical signal can be sampled. Then, an optical-audio transformation process recovers the original acoustic signal and the conversation itself.
Glowworm can only eavesdrop on audio output from the speaker itself, not any other audio in the same room. While the passive nature of Glowworm certainly makes it hard to detect, the usual electronic sweeps would not reveal an attack in progress; the one-sided nature of this eavesdropping is just one of the downsides to this otherwise fascinating research project.
You've probably already jumped to the most obvious mitigation conclusion: as Glowworm requires a clear line of sight to the power LED, closing the curtains, turning speakers around to face away from any window or sticking a piece of, oh the irony, electrical tape over the LED will all kibosh it. Don't get me wrong; I love this kind of research. It gets me out of bed in the morning and keeps me interested in what I do. But no matter how clever, fantastical, Glowworm is, what it isn't is something you need to worry about. There are far easier ways of breaching your privacy with far greater chances of success than this.
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