The Common Alerting Protocol (CAP) is a standardized data format for emergency messages. It lets different systems-such as public warning platforms, apps, and broadcast services-exchange alerts in a consistent structure, including information like the hazard, affected area, urgency, and instructions.
CAP can make alerts easier to distribute across multiple channels, but it does not by itself prove that a message is authentic. Security depends on the systems and people allowed to create, approve, and publish alerts, along with safeguards such as strong authentication, restricted access, and audit logs. In an attack, an intruder who gains access to a publishing system could issue or alter a false warning; defenders should secure that publishing chain and provide a trusted way to correct mistaken alerts.