Table 9 Authentication success rates after answering different number of questions for the threshold based scheme in study‐2.Th denotes threshold value and N denotes the number of questions aggregated across all sessions
From: Designing challenge questions for location‐based authentication systems: a real‐life study
N = 2 | N = 4 | N = 6 | |||||||
|---|---|---|---|---|---|---|---|---|---|
Legitimate | Strong | Naive | Legitimate | Strong | Naive | Legitimate | Strong | Naive | |
Th = 100 % | 73.0 % | 12.5 % | 1.1 % | 57.6 % | 5.6 % | 0.0 % | 44.8 % | 2.4 % | 0.0 % |
Th = 80 % | 73.0 % | 12.5 % | 1.1 % | 57.6 % | 5.6 % | 0.0 % | 70.5 % | 7.1 % | 0.0 % |
Th = 60 % | 73.0 % | 12.5 % | 1.1 % | 80.8 % | 12.9 % | 0.5 % | 85.8 % | 14.0 % | 0.3 % |
Th = 50 % | 90.9 % | 30.3 % | 8.3 % | 92.2 % | 24.5 % | 3.5 % | 93.9 % | 21.2 % | 1.4 % |