Interactive Tool for Quantum Cryptography BB84 Algorithm Demonstration

Quantum cryptography could be a solution to a challenge of a quantum computer being able to break RSA encryption potentially very soon. The BB84 protocol is elegant and simple, and yet not easy to grasp by students who lack background in probability, statistics or physics. In an undergraduate Fundamentals of Cybersecurity class, we provided students with hands-on practice of BB84 using the 3D printed laboratory kit that illustrates the algorithm in action. The exercise enabled students to roll binary dice and run their own experiments using lasers, light filters, and detectors, so they get empirical understanding how and why the stats work that make the encryption reliable. It also enabled students to work in pairs and exchange secret messages which contributed to active learning teaching practice. We collected students' self-reported learning benefits via survey. Most responded positively to the tool being useful, engaging, and increasing their understanding of the algorithm.