There was a great talk at Defcon in 2009 about sniffing keystrokes with voltmeters and lasers. It's worth watching the video[1] if you're interested in this audio technique.
The first part of their presentation uses a novel method to pick up PS/2 keystrokes from a system's ground connection. This presentation was what lead me to design the PS/2 tap[2] to sniff keystrokes with my sound card.
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There was a great talk at Defcon in 2009 about sniffing keystrokes with voltmeters and lasers. It's worth watching the video[1] if you're interested in this audio technique.
The first part of their presentation uses a novel method to pick up PS/2 keystrokes from a system's ground connection. This presentation was what lead me to design the PS/2 tap[2] to sniff keystrokes with my sound card.
[1] https://www.youtube.com/watch?v=9zq9DQAbWmU [2] https://github.com/dominicgs/PS2_tap