I discovered an interesting video at Hack a Day from the University of Princeton demonstrating how to break disk encryption using so called RAM Dumps. This basically takes into account that the encryption key is stored in RAM. While most disk encryption mechanisms are vulnerable while the computer is on or in sleep mode some are even vulnerable when powered off.
What they did was to boot the computer from an USB drive that would load a RAM dumping program. Tests conducted by the University of Princeton showed that it took between seconds and minutes before data that was stored in RAM was completely erased. The RAM also vanished in a predictable manner.
It’s interesting to see that cooling the RAM down to minus 50 degrees prolonged the time the data was readable, it was clearly readable after ten minutes. It’s a very interesting video in my opinion.
If you never thought about using a BIOS password and disabling booting from USB devices and CD / DVD before you should start thinking about it right now. That is if you use disk encryption.
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