Or apparently just plug your laptop into its DC power supply, or use a CRT monitor, or the PSU in a desktop, or generate some EM noise on the same band as the keyboard.
Note how they were very careful to isolate the keyboard from any potential source which would contaminate the signal. Therein lies how to secure the system; obscure it in noise and suddenly the keyboard presses are indistinguishable from noise.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Time to wrap my keyboard in a faraday cage..
And your complete workstation...
Or apparently just plug your laptop into its DC power supply, or use a CRT monitor, or the PSU in a desktop, or generate some EM noise on the same band as the keyboard.
Note how they were very careful to isolate the keyboard from any potential source which would contaminate the signal. Therein lies how to secure the system; obscure it in noise and suddenly the keyboard presses are indistinguishable from noise.
Don't keyboards generate electromagnetic fields at a different frequency than CRTs, etc?