Multimodal Continuous User Authentication on Mobile Devices via Interaction Patterns

Table 1

The HM and HP feature set.

Type	Feature	Description
HP	start_x, start_y	Starting point coordinates of and
	stop_x, stop_y	End points of and coordinates
	velocity_x,y_max	Maximum velocities of trajectory in and directions
	velocity_x,y_mean	Average rates of trajectory in and directions
	acc_x,y,z_max	Maximum accelerometers of -, - and -axes
	acc_x,y,z_ min	-, - and -axis acceleration minimum
	pressrue_max,min	Maximum and minimum pressures in trajectory
	pressure_median	Median pressure value
	pressure_mean	Pressure mean value
	pressrue_std	Pressure standard deviation value
	acc_x,y,z_mean	Average acceleration values of -, - and -axes
	acc_x,y,z_std	-, -, and -axes acceleration variance
HM	direct_distance	End-to-end straight distance of the track
	real_distance	Trajectory distance of actual sliding
	storke_duration	Sliding trajectory duration
	swpie_velocity	Finger sliding velocity
	acc_x,y,z_Begin_Max_rate	Change rates of acceleration of -, - and -axes to the maximum value
	acc_x,y,z_max_to_min	Maximum and minimum differences of -, -, -axis acceleration
	acc_x,y,z_End_Max_Rate	Change rates of acceleration of -, -, and -axes to the minimum value
	pressure_start_to_end	Pressure difference between the start point and the end point
	pressure_Begin_Max_rate	Rate of change from pressure at the beginning of trajectory to maximum pressure
	pressure_End_Max_rate	Rate of change from maximum pressure of trajectory to end pressure
	velocity_x, y_Begin_Max_rate	Rates of change from and starting point rates to maximum rates
	velocity_x,y_max_to_end	The difference between maximum speed of and coordinates and the speed at the end point
	velocity_x,y_End_Max_rate	Rate sof change from and end point rates to maximum rates
	velocity_x,y_End_Min_rate	Rates of change from and end rates to minimum rates