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ChristianKl comments on Open thread for December 17-23, 2013 - Less Wrong
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Eh... if an attacker has the level of physical access to the CPU that's required to plant a microphone, you have worse problems than acoustic attacks.
In the example the used a mobile phone. Going from having owned a microphone to being able to know a key on a computer is a significant step.
Additionally there are other way to get audio access. Heating pipes conduct sound waves if the attacker has a good microphone.
Glass of windows vibrates in a way that can be detected from a distance.