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Table 11 Authentication success rate after answering different of questions aggregated across all sessions and using all possible combinations of eight response features for Bayesian classifier based scheme in Study ‐ 2

From: Designing challenge questions for location‐based authentication systems: a real‐life study

of questions\ Against naive Against strong+ Against strong
against adversary adversaries Naive adversaries adversaries
lr)2‐3lr)4‐5lr)6‐7 Legitimate Naive Legitimate Strong+Naive Legitimate Strong
N = 2 91.6 % 14.9 % 87.4 % 23.0 % 82.2 % 25.6 %
N = 4 96.4 % 11.0 % 93.3 % 18.2 % 89.5 % 24.5 %
N = 6 98.1 % 5.7 % 95.6 % 14.2 % 94.1 % 19.9 %