A computer assembly for identifying, sharing and managing data, said computer system comprising at least one data server, said server having software providing a determined function, said computer assembly having at least: - a first critical system and a second non-critical system (30, 40), - a first interface comprising: ▪ a first digital interface for monitoring and bidirectionally transmitting data between the data server and the critical system, the monitoring of each datum consisting in verifying that the datum is in accordance with a predetermined definition, belongs to a predetermined list, has a unique identifier and has the source of its application in its identifier; ▪ a first physical interface for physically linking the first digital interface with the critical system; - a second interface comprising: ▪ a second digital interface (12, 16, 17) for monitoring and bidirectionally transmitting data between the data server and the second non-critical system, the monitoring of each datum consisting in verifying that the datum is in accordance with a predetermined definition, belongs to a predetermined list, has a unique identifier and has the source of its application in its identifier; ▪ a second physical interface (13, 18) for physically linking the second digital interface with the second system; - the specific function of said software consisting in transforming input data coming from both the first critical system and the second non-critical system into new output data, and in providing the output data to the first interface and to the second interface. - a first critical system and a second non-critical system (30, 40), - a first interface comprising: ▪ a first digital interface for monitoring and bidirectionally transmitting data between the data server and the critical system, the monitoring of each datum consisting in verifying that the datum is in accordance with a predetermined definition, belongs to a predetermined list, has a unique identifier and has the source of its application in its identifier; ▪ a first physical interface for physically linking the first digital interface with the critical system; ▪ a first digital interface for monitoring and bidirectionally transmitting data between the data server and the critical system, the monitoring of each datum consisting in verifying that the datum is in accordance with a predetermined definition, belongs to a predetermined list, has a unique identifier and has the source of its application in its identifier; ▪ a first physical interface for physically linking the first digital interface with the critical system; - a second interface comprising: ▪ a second digital interface (12, 16, 17) for monitoring and bidirectionally transmitting data between the data server and the second non-critical system, the monitoring of each datum consisting in verifying that the datum is in accordance with a predetermined definition, belongs to a predetermined list, has a unique identifier and has the source of its application in its identifier; ▪ a second physical interface (13, 18) for physically linking the second digital interface with the second system; ▪ a second digital interface (12, 16, 17) for monitoring and bidirectionally transmitting data between the data server and the second non-critical system, the monitoring of each datum consisting in verifying that the datum is in accordance with a predetermined definition, belongs to a predetermined list, has a unique identifier and has the source of its application in its identifier; ▪ a second physical interface (13, 18) for physically linking the second digital interface with the second system; - the specific function of said software consisting in transforming input data coming from both the first critical system and the second non-critical system into new output data, and in providing the output data to the first interface and to the second interface.