USER PASSWORD INPUT SYSTEM FOR PROTECTING THE USER'S PRIVACY AGAINST A SHOULDER-SURFING ATTACK AND USER PASSWORD INPUT METHOD FOR PROTECTING THE USER'S PRIVACY AGAINST A SHOULDER-SURFING ATTACK

摘要

PURPOSE: A user password input system is provided to protect the user's privacy against a shoulder-surfing attack using different colored keypad. CONSTITUTION: Surrounding numbers are composed of different number with a central number. A keypad comprises a plurality of lower keypads. Each lower keypad has different color, central number, and numbers in the lower keypads. A color/shadow selection module selects a color or shadow of the lower keypad corresponding to the location of the user selected key. A shuffling module changes a plurality of central number of a keypad and surrounding numbers.