Tricking the eye to defeat shoulder surfing attacks

Researchers have developed the first application to combat ‘shoulder-surfing’ of PINS and passwords: a hybrid-image keyboard that appears one way to the close-up user and differently at a distance. The technology blends one image of a keyboard configuration with high spatial frequency and a completely different one with low spatial frequency. Experiments showed it was effective for mobile phones and when video cameras recorded PIN entry, as might happen at an ATM.
Go to Source