Secure electronic exam

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Tezin Türü: Doktora

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Matematik Bölümü, Türkiye

Tezin Onay Tarihi: 2016

Öğrenci: LÜTFÜ TARKAN ÖLÇÜOĞLU

Danışman: ALİ DOĞANAKSOY

Özet:

With the recent developments in information technology, computers and mobile devices have an important role in daily life. The field of education are also affected by these developments, as a result electronic learning (e-learning) subject becomes popular. By the developments in e-learning area, students are now able to reach their documents using computers instead of books. This situation provides teachers to perform exams in digital environments. Information security concepts in an exam should be satisfied in order to get reliable evaluation in education. Some of the candidates can use illegal ways to reach exam questions before exam or change their scores during or after exam. To prevent these, cryptography plays an essential role in electronic exam. Therefore, a secure electronic exam is one of the most vital and difficult part in e-learning security. In this thesis,we first give a model satisfying authenticity, anonymity, secrecy and long term confidentiality on sensitive data. The model is using ID-Based cryptosystems for authentication, sanitizable signature schemes for data editing and verifiable secret sharing schemes for long term confidentiality issues. A novel secure electronic exam approach is proposed by combining sanitizable signature and ID-Based cryptography. Then, security analysis of the proposed model is discussed.