If you're using a keypad for a security device, you might consider this: It's possible to glean the numbers using a thermal camera. Should someone come upon the device shortly after inputting the security code, you can check the heat signature and figure out the numbers, and if you're good, the sequence based on the heat signature.
Download the detailed PDF describing the process via UseNix:
www.usenix.org/events/woot11/tech/final_files/Mowery.pdf
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