Leveraging Battery Usage from Mobile Devices for Active Authentication

Figure 8

False Acceptance versus False Rejection Rates for different smoothing levels on the user models. FAR was calculated using four different attack models: (i) using 5 random (time, charge) samples from every known user (blue line); (ii) using the global probability estimation to find the most likely charge value at each time of the day (green line); (iii) the adversary always reporting 100% battery charge (yellow line); and (iv) using 2500 random samples of other users having the same mobile device model (orange line).