Gaze Tracking Unlocking Resists Shoulder-Surfing

The patent replaces visible mechanical input methods (typing passwords, drawing patterns on screens) with an optical/biological measurement method (eye gaze tracking). The system captures eye movement data through cameras and processes it to determine unlocking actions, making the unlocking process invisible to observers while maintaining user accessibility.

The patent changes the measurement parameter from static facial features (which can be replicated in photos or masks) to dynamic eye movement trajectories. By capturing the temporal sequence and pattern of eye movements across multiple images, the system creates a unique behavioral signature that is difficult to replicate through presentation attacks.

The patent transforms the unlocking mechanism from a static fixed trajectory to a dynamic adaptive system. The system randomly selects from multiple images and dynamically adjusts the expected gaze trajectory based on the selected image content, making prediction attacks ineffective while maintaining ease of use through natural eye movement patterns.

The patent substitutes mechanical interaction requirements (hand dexterity for typing or drawing) with ocular movement, which is accessible to users with various physical disabilities. This allows users with motor impairments, arthritis, or other disabilities that affect hand coordination to unlock devices through natural eye movements.