Implementation of parallel model checking for computer-based test security design

Computer-based test (CBT for short) has become a new form of delivering test. This causes a challenge of unethical conduct during examinations such as cheating and accessing test data before the examination. Model checking is a promising approach to analyse the behavior and correctness of secured system. However, if a system has a large-scale behavior, we cannot apply model checking because of state space explosion. In this paper, we gave a security considerations of CBT and proposed a Petri net-based framework of parallel model checking with a Petri net splitting procedure. The proposed framework is useful to reduce the size of the net, thereby increases the applicability of model checking to security protocol verification. It allows us to analyse the property of each splitted nets simultaneously. We illustrated the proposed framework with a product called as E-monitoring with biometric authentication scheme as an application example.