BIDIRECTIONAL GATEWAY WITH ENHANCED SECURITY LEVEL

摘要

A secure gateway allows bidirectional communication between two communication networks. A first high-security network and a second network whose security is lower. The gateway is bidirectional with enhanced security level between a high-security communication network and a low-security communication network. For this purpose, the return pathway from the low-security network to the high-security network comprises a low-speed link. The physical layer of this low-speed link differs from the physical layers involved both in the high-security network and in the low-security network. This low-speed link is endowed with a linking layer according to a protocol which differs from the protocols used on the linking layers used both on the high-security network and on the low-security network. Advantageously, the linking layer of the low-speed link is furnished with an authentication protocol making it possible to guarantee the origin of the data.