The Technique of Network Diode

While enterprise information improves its business productivity, it also puts forward higher requirements for enterprise information security. In order to ensure data security of enterprises´ critical businesses and implement information synchronization between different levels of security of internal network, this paper puts forward a type of data transmission technique based on the signal feedback mechanism and physical one-way link, details its model, and analyses its realization principles. The technique has been applied to secure access between DCS (Distributed Control System) and MIS (Management Information System) of electric power system, it is proved to be real-time, reliable and secure.