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Schneier on Security

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  Eavesdropping on Dot-Matrix Printers by Listening to Them

  Posted: June 23rd, 2009, 6:16am CDT

  Tags:    [edit]

  Interesting research. First, we develop a novel feature design that borrows from commonly used techniques for feature extraction in speech recognition and music processing. These techniques are geared towards the human ear, which is limited to approx. 20 kHz and whose sensitivity is logarithmic in the frequency; for printers, our experiments show that most interesting features occur above 20 kHz,...