With the development of modern Communication Based Train Control System, Digital Wireless Communication System will be widely used as the platform between On-board and Track-side. As a specialized application of the integrated dedicated Digital Mobile Communication System for the development of railway, GSM-R is characterized by adapting to rail transport and it has an advantage of mature technology. In line with the communication signals of the development of the integration of technology, it will be a wider range of promotion and application. However, the control information and management information between On-board and Track-side, as a result of the traffic safety and efficiency, the safety of GSM-R communication mechanism is paid much attention, and it has become the key of current communication between On-board and Track-side research.In this paper, we research the safety mechanisms of Euroradio (GSM-R) in European Train Control System. On the basis of that, a safe encryption system for GSM-R is designed and implemented.
