  Previous studies have demonstrated that commonly studied (vanilla)
touch-based continuous authentication systems (V-TCAS) are susceptible to
population attack. This paper proposes a novel Generative Adversarial Network
assisted TCAS (G-TCAS) framework, which showed more resilience to the
population attack. G-TCAS framework was tested on a dataset of 117 users who
interacted with a smartphone and tablet pair. On average, the increase in the
false accept rates (FARs) for V-TCAS was much higher (22%) than G-TCAS (13%)
for the smartphone. Likewise, the increase in the FARs for V-TCAS was 25%
compared to G-TCAS (6%) for the tablet.
