Seeing Through Walls

This attack is very cool [via Schneier on Security ]

With a flat panel display the aim is to tune into the radio emissions produced by the cables sending a signal to the monitor. The on-screen image is fed through the cable one pixel at a time. Because they come through in order you just have to stack them up. And Kuhn has worked out how to decode the colour of each pixel from its particular wave form.

Here is an image that was taken using this method:

In case you’re wondering laptops are not immune either.

I like this potential information stealing method because it goes for a very weak component of the system much like keystroke loggers do.

It’s the computer way of kicking a mugger in the groin, using caltrops to stop car chases, or feeding sharks before swimming with them so they don’t eat you.