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Hacking Keyboards

A team of Swiss researchers say there are several ways to get back what you type into a standard keyboard connected by simply measuring cable electro magnetic radiation emitted when keys are pressed.





In total, the team of researchers from the Security and Cryptography Laboratory in Lausanne, Switzerland, found four different ways to recover all or part of it typed from wired keyboards at a distance of 20 meters, even through walls.



A research paper will be published after a peer review process. Team members Martin Vuagnoux and Sylvain Pasini explain the findings :

To determine if wired keyboards generate compromising emanations, we measured the electromagnetic radiations emitted when keys are pressed. To analyze compromising radiations generally use a receiver tuned on a specific frequency. However, this method may not be optimal: the signal does not contain the maximal entropy since a significant portion is lost.

Our approach was to capture the signal directly from the antenna and to work with the entire electromagnetic spectrum captured.

We found 4 different ways ( including the Kuhn attack . Pdf) to recover fully or partially typed it from wired keyboards at a distance up to 20 meters, even through walls. We tested 11 different keyboard models purchased between 2001 and 2008 (PS / 2, USB and laptop). All are vulnerable to at least one of our 4 attacks.

conclude that computer keyboards (with cable) sold in the stores generate compromising emanations (mainly because of the pressure to keep costs in the design). Therefore these are not safe to transmit sensitive information. No doubt our attacks can be significantly improved, since we used relatively inexpensive equipment.

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