http://www.wisdom.weizmann.ac.il/~tromer/acoustic/
Acoustic Cryptanalysis: On nosy people and noisy machines Adi Shamir and Eran Tromer A powerful method for extracting information from supposedly secure systems is side-channel attacks, i.e., cryptanalytic techniques that rely on information unintentionally leaked by computing devices. Most attention has been focused on electromagnetic emanations, power consumption and, recently, diffuse visible light from CRT displays. The oldest eavesdropping channel, namely acoustic emanations, has received little attention. The following demonstrates some preliminary results in the analysis of acoustic emanations from personal computers, showing them to be a surprisingly rich source of information on CPU activity. May 7, 2004
