Disclosed is a secured transportation control network. A distributed set of transportation network management units are spread across different functional points of the transportation network. At least one network management unit agent functionally coupled to a respective network management unit is adapted to monitor communications of the respective management unit. A behavior monitoring server is adapted to generate a behavior profile for a network management unit based on information provided by an agent functionally coupled to the network management unit. A communication policy generator generates for at least one network management unit a communication policy based on behavior profiles of network management units with which the at least one network management unit communicates; wherein the communication policy is sent to an agent application functionally coupled to the at least one network management unit.