In this system, the lines of a user's palm become the key to revealing a password. Samsung depicts the hint as incomplete letters that are seemingly randomly positioned on the screen.

However, the position of each partial letter is customized to the enrolled user's palm. When users hold their palm up to the rear camera and the device recognizes it, the lines of the palm displayed on the screen help reveal the characters in a password. That's still just a hint given that it doesn't necessarily reveal their order.