Acoustic Attacks

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There are two forms of acoustic attack. The first is against the machine and is largely similar to the other forms of side-channel attacks. By monitoring the "humming" noise emitted from a processor, you can determine certain aspects of the computations being carried out. Farfetched as this might seem, A. Shamir and E. Tromer showed that is it not only possible to obtain information this way, but also even great amounts of background noise cannot disrupt this technique.

The other type of acoustic attack is based around the sounds that the user makes, and not just the grunting and cursing under the breath types of noises, but sound of typing on the keyboard. In a 2004 paper, "Keyboard Acoustic Emanations," D. Asonov and R. Agrawal made use of a neural network to differentiate between the sounds of each of the keys not only on a standard computer keyboard but also on ATM pin pads and telephone keypads.

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