The issue of reliability in online education has to be seriously addressed to ensure the identity of exam-takers and that the answers they provide are the result of their own work.
Previous research shows that making people aware of their own values has a decisive influence on their ethical and moral behavior. For example, students who signed a Pledge of Ethics before starting their exams showed no fraudulent behavior like cheating or plagiarism. (see Ariely, 2012, page 42) - an excellent book if you do not know it yet!