Understanding Keystroke Dynamics for Smartphone Users Authentication and Keystroke Dynamics on Smartphones Built-In Motion Sensors

Table 2

Types and numbers of features from the PIN, “766420.”

	Raw data
	1 key
Type	Keystroke									Motion
Feature	Time					Size		Coordinate		Acc			Grot			Gyr
	DT	FT1	FT2	FT3	FT4	sizeDn	sizeUp	Dn	Up
Each #	1	1	1	1	1	1	1	2	2	Formula
	5					2		4		1	1	1	1	1	1	1	1	1
	11 features									9 features
Total #	20 features per 1 key
	1 sample = 20 6 = 120 features