Now to secure a mixed mode terminal teletex X.25 network

This paper gives a conceptual analysis of the protection of a network of PC workstations. It analyses the pro blematic of protection and suggests a rudimentary solution. The network described is an existing network in Belgium, however, because of security reasons it is not possible to give more information on the nature of this network. Nevertheless, this will not prevent us of describing an adequate security solution for this kind of network. The network itself is consisted of a number of PC work stations, connected through the packet-switched data network (X.25/TELETEX).