Over the past fifteen years or so, cyber attacks have intensified and diversified. Their first victims are very small businesses and local authorities. According to the Institut Montaigne report, "Cybersécurité : passons à l'échelle" (June 2023), while awareness of the cyber threat is now a reality, accompanied by a willingness to act, the apparent complexity of the subject and the lack of resources and support remain obstacles. Understanding cyber issues is an essential prerequisite for taking action. But how do you go about it? An overview with Docaposte.