3 ms·
Related to reading information from LEDs, thought this paper was cool - http://www.applied-math.org/optical_tempest.pdf http://www.applied-math.org/optical_temp
by anfractuosity 5y ago
Related to reading information from LEDs, thought this paper was cool - http://www.applied-math.org/optical_tempest.pdf http://www.applied-math.org/optical_tempest.pdf (from 2002)
"Dial-up and leased-line modems were found to faithfully broadcast data transmitted and received by the device"
Edit: Also it looks like Loughry has proposed similar work, using lasers and LEDs https://arxiv.org/pdf/1907.00479.pdf https://arxiv.org/pdf/1907.00479.pdf
- KennyBlanken 5y agoResearch 10+ years ago found that activity lights on many network cards and switches at 10BaseT could reveal actual network traffic. Very quickly, major device manufacturers switched to buffered activity LEDs and the attack became useless. I remember at one point modems switched from flickering with actual traffic to just slow blinking with activity.