Editing Safe-cracking (section)

=== High-security keypads ===
Some keypads are designed to inhibit the aforementioned attacks. This is usually accomplished by restricting the viewing angle of the keypad (either by using a mechanical shroud or special buttons), or randomizing the positions of the buttons each time a combination is entered.

Some keypads use small [[Light-emitting diode|LED]] or [[Liquid-crystal display|LCD]] displays inside of the buttons to allow the number on each button to change. This allows for randomization of the button positions, which is normally performed each time the keypad is powered on. The buttons usually contain a [[Lens (optics)|lenticular]] screen in front of the display, which inhibits off-axis viewing of the numbers.

When properly implemented, these keypads make the "[[Shoulder surfing (computer security)|shoulder surfing]]" attack infeasible, as the combination bears no resemblance to the positions of the keys which are pressed.

While these keypads can be used on safes and vaults, this practice is uncommon.