Embodiments of the present disclosure relate to a new approach for sensor-based authentication to enhance mobile security. In the computer-implemented method, motion related sensor data is obtained. A label of a behavior is determined wherein the behavior has a time information of the behavior. The label is associated with at least part of the motion related sensor data based on the time information of the behavior and the time information of the motion. At least one comparable motion is determined from the associated part of motion related sensor data. At least one motion passcode based on the determined comparable motion is identified.