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Table 2 List of question types generated by the application

From: Evaluating smartphone-based dynamic security questions for fallback authentication: a field study

Question type

Question

Retrieval type

Call

Who called you on <time> ?

Who did you call on <time> ?

Recall

SMS

Who SMS messaged you on <time> ?

Who did you SMS message on <time> ?

Recall

Location

Where were you on <time> ?

Recall

Application

What are the applications you used in the last 24 h?

Recognize

Music

What are the music you listened to in the last 24 h?

Recognize

Activity

What activities did you perform in the last 24 h and when?

Recognize and recall

Battery

When did you charge your phone in the last 24 h and how was it charged?

Recognize and recall