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Table 1 Time Window‐Location Matrix of a user’s history

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

Window\Day Nov 14 Nov 15 Nov 21
00:00−00:14 Home Home Bronx
00:15−00:29 Home Home Bronx
14:00−14:14 Office Lab Bronx
14:15−14:29 Unknown Lab Bronx
14:30−14:44 Lab Lab Unknown
18:00−18:14 Supermarket Home I p p u d o N Y
18:15−18:29 Supermarket Home I p p u d o N Y
18:30−18:44 Unknown Home Unknown
18:45−18:59 Home Home Cinema
21:00−21:14 F r i e n d s H o m e Restaurant R i d g e H i l l
21:15−21:29 F r i e n d s H o m e Restaurant R i d g e H i l l
23:45−23:59 Home Home R i d g e H i l l