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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