A Dynamic Profile Questions Approach to Mitigate Impersonation in Online Examinations
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Online examinations are an integral component of many online learning environments, which face many security challenges. Collusion is seen as a major security threat to such examinations, when a student invites a third party to impersonate or abet in a test. This work aims to strengthen the authentication of students via the use of dynamic profile questions. The study reported in this paper involved 31 online participants from five countries over a five-week period. The results of usability and security analysis are reported. The dynamic profile questions were more usable than both the text-based and image-based questions (p < 0.01). An impersonation abuse scenario was simulated using email and mobile phone. The impersonation attack via email was not successful, however, students were able to share answers to dynamic profile questions with a third party impersonator in real time, which resulted in 93% correct answers. The sharing of information via phone took place in real time during an online test and the response time of an impersonator was significantly different (p < 0.01) than a student. The study also revealed that a response time factor may be implemented to identify and report impersonation attacks.
Journal of Grid Computing;
Ullah, A., Xiao, H. and Barker, T. Journal of Grid Computing (2018) 'A Dynamic Profile Questions Approach to Mitigate Impersonation in Online Examinations', Journal of Grid Computing, https://doi.org/10.1007/s10723-018-9442-6
This article was published in Journal of Grid Computing on 31 May 2018, available open access at https://doi.org/10.1007/s10723-018-9442-6
- Computing and IT 
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