Sensor Guardian: prevent privacy inference on Android sensors

EURASIP Journal on Information Security

Table 2 Time overhead for different sensors at different sampling rate and under different policies

Sensor type	Sampling rates	Original mean time interval between events (int _orig, unit: μs)	Policies	Absolute time overhead (int _inst− int _orig, unit: μs)	Relative time overhead ((int _inst− int _orig)/int _orig, unit: ⁰ /₀₀₀)
	Fastest	8392.208918	Allow All	0.07	0.08
			Deny All	0.001	0.001
Accelerometer			Randomization	0.02	0.02
	Game	20141.28197	Allow All	0.08	0.04
			Deny All	0.03	0.01
			Randomization	0.16	0.08
	Fastest	16784.63194	Allow All	0.008	0.005
			Deny All	0.009	0.005
Magnetic field			Randomization	0.002	0.001
	Game	20141.59088	Allow All	0.02	0.009
			Deny All	0.004	0.002
			Randomization	0.04	0.02
	Fastest	5035.314463	Allow All	0.003	0.001
			Deny All	0.01	0.02
Gyroscope			Randomization	0.01	0.01
	Game	20141.28592	Allow All	0.16	0.08
			Deny All	0.12	0.06
			Randomization	0.03	0.02