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Table 6 Security analysis

From: Evaluating security and usability of profile based challenge questions authentication in online examinations

Question themes Security abuse case
N Equality algorithm Relaxed algorithm
Academic questions   Matched Unmatched Matched Unmatched
Student number 1 0(0%) 1(100%) 0(0%) 1(100%)
Year started the current course 3 0(0%) 3(100%) 0(0%) 3(100%)
Year of highest qualification 1 1(100%) 0(0%) 1(100%) 0(0%)
Highest qualification 2 0(0%) 2(100%) 0(0%) 2(100%)
Find out about this course 0 *NA *NA *NA *NA
Name of last school attended 2 0(0%) 2(100%) 0(0%) 2(100%)
Grades in highest qualification 2 0(0%) 2(100%) 0(0%) 2(100%)
Month started the current course 2 0(0%) 2(100%) 0(0%) 2(100%)
Total 1(8%) 12(92%) 1(8%) 12(92%)
Personal questions
Best friend’s surname 1 0(0%) 1(100%) 0(0%) 1(100%)
Country of birth 2 1(50%) 1(50%) 2(100%) 0(0%)
Father’s surname 1 0(0%) 1(100%) 1(100%) 0(0%)
Dream job as a child 0 *NA *NA *NA *NA
Total 1(25%) 3(75%) 3(75%) 1(25%)
Favourite questions
Tutor 1 0(0%) 1(100%) 0(0%) 1(100%)
Hero of your childhood? 0 *NA *NA *NA *NA
Module on this course? 1 0(0%) 1(100%) 0(0%) 1(100%)
Total 0(0%) 2(100%) 0(0%) 2(100%)
Contact questions
Home tel no with country code 1 0(0%) 1(100%) 0(0%) 1(100%)
Home address town 1 0(0%) 1(100%) 0(0%) 1(100%)
House name or number 1 0(0%) 1(100%) 0(0%) 1(100%)
Mobile number including country code 1 1(100%) 0(0%) 1(100%) 0(0%)
Total 1(25%) 3(75%) 1(25%) 3(75%)
Date questions
Date of birth? 1 0(0%) 1(100%) 0(0%) 1(100%)
Grand total 24 3(13%) 21(88%) 5(21%) 19(79%)
  1. *NA: Questions not presented due to randomization.
  2. Data in bold-face show an increase in correct answers during abuse case when results were computed using a relaxed algorithm.