“Perimetro pubblico” refers to the public-sector boundary in which data, accountability, and operational control remain under public governance. In practice, it is the trust boundary around municipal systems, shared public platforms, and the staff, policies, and infrastructure that administer them. It helps define who can access data, who can change systems, and who is responsible when something goes wrong.
In cyber security, this boundary matters because it changes the risk profile of cloud use, third-party dependencies, and shared services. Keeping services inside the public perimeter can reduce exposure to external providers, but it also demands strong logging, segmentation, backup, identity controls, and incident response. Attackers often target weak links at this boundary: misconfigurations, poor vendor oversight, and lateral movement across shared environments. Defenders use the public perimeter to enforce data minimization, auditability, and clear ownership, making it easier to prove control and recover safely after an intrusion.