Abstract: A unidirectional communication system to allow the sending of alerts and notification to remote operators while relieving the problem of the protection of a secured network against cyberattacks when the secured network has a need to communicate information from the secured network to a public network. In practice, the solution is based on the use of a data diode (also known under the name of network diode) to allow unidirectional transmission of information from the secured network to a public network, which makes a computer attack on the secured network from the public network impossible. Further, because of a commanded data diode, no sensitive information can leak from the secured network via the system according to the invention. The transmission of the message is only done after the message to be sent has been cleaned of sensitive information and then encrypted.