4 ms·
The graphs they present show the largest response with 110db audio, which is about as loud as a car honking right in front of you[1], but even still, to eavesdr
by lsb 6y ago
The graphs they present show the largest response with 110db audio, which is about as loud as a car honking right in front of you[1], but even still, to eavesdrop on corner offices from tens of meters away with nothing but a telescope and a video recorder is a huge feat.
[1] https://www.chem.purdue.edu/chemsafety/Training/PPETrain/dblevels.htm https://www.chem.purdue.edu/chemsafety/Training/PPETrain/dbl...
- Retric 6y agoThat’s to be expected, but they could still recover audio at vastly lower DB levels.
- madengr 6y agoPointing a telescope at tens of meters away will get you noticed pretty quick. Now one can sell lightbulbs with noise modulation to defeat it.
- hedora 6y agoYeah, not sure why they patented the attack, and not the defense. It seems much easier to enforce a patent against technologies that defeat the attack. From the article, it looks like one can build the surveillance device from a few readily available parts, and then hack together the signal processing software. That’s not even in violation of the patent if you don’t sell / distribute it.
- afrcnc 6y agoThe attack obviously works only at night, when the light bulbs are on. Pretty sure you can easily disguise it.