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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 %