“…The accelerometer provides the gravitational acceleration in three spatial dimensions (axes), x, y, and z, measured in meter per second squared, where the axes denote the vertical, and left-to-right dimensions [76]. The gyroscope measures the angular rotation Picking-up Motion Ac, Gy, Ma SVM 31 6.13% [63] Motion & keystroke Ac, Gy, Pr SVM 100 1.25% 99.13% [64] Motion Gesture Ac SVM 8 95.83% [65] In-air Handwriting LMC SVM 100 0.6% [66] In-air Handwriting Ac, Gy RF 5 32.8 † % [67] Shacking Motion Ac, Gy DTW-LSTM 150 0.1% 96.87% [68] Free-form Gesture Ac, Gy DTW 3% 0.02% 10% [69] In-air Handwriting Ac DTW * 34 2.5% [70] In-air Handwriting Ac, Gy, Or MLP 84.5% [39] Pick-up Motion Ac CC 10 1.46% 6.87% [71] Motion Gesture Ac, Gy in three dimensions, x, y, and z, in radians per second along the axes [68]. Such sensory data provides a feature space that enables the modeling of users' movement and usage; therefore, a variety of methods revolve around utilizing such data for authentication and security.…”