A Secure Exam Protocol Without Trusted Parties

Interdisciplinary Research Group in Socio-technical Cybersecurity

A Secure Exam Protocol Without Trusted Parties

Giampaolo Bella, Rosario Giustolisi, Gabriele Lenzini, Peter Y. A. Ryan
Abstract:
Relying on a trusted third party (TTP) in the design of a security protocol introduces obvious risks. Although the risks can be mitigated by distributing the trust across several parties, it still requires at least one party to be trustworthy. In the domain of exams this is critical because parties typically have conflicting interests, and it may be hard to find an entity who can play the role of a TTP, as recent exam scandals confirm. This paper proposes a new protocol for paper-based and computer-based exams that guarantees several security properties without the need of a TTP. The protocol combines oblivious transfer and visual cryptography to allow candidate and examiner to jointly generate a pseudonym that anonymises the candidate’s test. The pseudonym is revealed only to the candidate when the exam starts. We analyse the protocol formally in ProVerif and prove that it satisfies all the stated security requirements.
Authors:
Giampaolo Bella, Rosario Giustolisi, Gabriele Lenzini, Peter Y. A. Ryan
Publication date:
2015
Published in:
IFIP Advances in Information and Communication Technology
Reference:
Bella, G., Giustolisi, R., Lenzini, G., & Ryan, P. Y. (2015, May). A secure exam protocol without trusted parties. In IFIP International Information Security and Privacy Conference (pp. 495-509). Springer, Cham.

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