And remember just because you’re paranoid, it doesn’t mean you aren’t under surveillance.
From the link, ten methods to grab voice and data on the sly:
3. Laptop eavesdropping via lasers: Bouncing lasers off laptops and capturing the vibrations made as keys are struck give attackers enough data to deduce what is being typed. Each key makes a unique set of vibrations different from any other. The space bar makes an even more unique set, Barisani and Bianco say.
Language analysis software can help determine which set of vibrations correspond to which key, and if the attacker knows the language being used, the message can be exposed, they say.
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