High powered optics and a computer program is all that is needed to duplicate your keys according to three people at the University of California, San Diego..."Our SNEAKEY system correctly decoded the keys shown in the above image that was taken from the rooftop of a four floor building. The inlay shows the image that was used for decoding while the background provides a context for the extreme distances that our system can operate from. In this case the image was taken from 195 feet. This demonstration shows that a motivated attacker can covertly steal a victim's keys without fear of detection. The SNEAKEY system provides a compelling example of how digital computing techniques can breach the security of even physical analog systems in the real-world. (their paper)
Moral: Don't leave your keys where others can "see" them. But, you already knew that.
