The ATN (Aeronautical Telecommunication Network) is designed to present a global internetworking infrastructure for future aeronautical telecommunications. To verify the protocols of ATN ICS (Internet Communication Service), we conducted an interoperability experiment between ENRI (Electronic Navigation Research Institute) and WJHTC (William J. Hughes Technical Center) of FAA (Federal Aviation Administration) using VDL (VHF Digital Link)-mode3 subnetwork and the Internet. And we also conducted an experiment using VDL-mode3 subnetwork to evaluate the performance of the Air/Ground applications of ATN. This report describes the outlines and results of those experiments. The results of the interoperability experiment show that the protocols and the ISO8208 mobile SNDCF (Subnetwork Dependent Convergence Function) of ENRI-ICS are compatible with those of FAA-ICS. But some differences and malfunctions were observed in connections between Air/Ground ATN Routers. And the results of performance experiment show that the ISO8208 mobile SNDCF is effective to the Air/Ground communications.

The ATN (Aeronautical Telecommunication Network) is designed to present a global internetworking infrastructure for future aeronautical telecommunications. This report presents the development of the ATN security functions conducted by ENRI (Electrocin Navigation Research Institute) and the interoperability tests between ENRI and STNA (Service Technique de la Navigation Aérienne). The ATN security utilizes the Elliptic Curve Cryptography. This report first describes the outline of ATN security. And then it describes individual exchange procedures of security items between BIS (Boundary Intermediate System)s and CM (Context Management) applications, and shows the implementations of ATN security functions on the protocol stack of experimental simulation system called EAST (Enri ATN Simulation Test bed). To evaluate the performance of the ATN security, we conducted a laboratory experiment with EAST. The results of this experiment are also described in this report. And we also conducted interoerability experiments of CM applications and CM security functions between ENRI and STNA, to validate ATN Air/Ground and security SARPs (Standards And Recommended Practices). The outline and the results of the experiments are also described in this report.