Computers leak secrets. Not just through invasive ad tracking, data-stealing malware, and your ill-advised oversharing on social media, but through physics. The movements of a hard drive’s components, keystrokes on a keyboard, even the electric charge in a semiconductor’s wires produce radio waves, sound, and vibrations that transmit in all directions and can—when picked up by someone with sufficiently sensitive equipment and enough spycraft to decipher those signals—reveal your private data and…

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