The ANSSI core missions are:

 To detect and early react to cyber attacks, thanks to the creation of a strong operational center for cyber defence, working round-the-clock and being in charge of the continuous surveillance of sensitive Governmental networks, as well as the implementation of appropriate defence mechanisms;

 To prevent threats by supporting the development of trusted products and services for Governmental entities and economic actors;

 To provide reliable advice and support to Governmental entities and operators of Critical Infrastructure;

 To keep companies and the general public informed about information security threats and the related means of protection through an active communication policy.