  The fundamental principles of quantum mechanics are considered to be hard for
understanding by unprepared listeners, many attempts of its popularization
turned out to be either difficult to grasp or incorrect. We propose quantum
cryptography as a very effective tool for quantum physics introduction as it
has the desired property set to intrigue students and outline the basic quantum
principles. A modular desktop quantum cryptography setup that can be used for
both educational and research purposes is presented. The carried out laboratory
and field tests demonstrated usability and reliability of the developed system.
