Critical informational infrastructure refers to the information systems and channels a society depends on to communicate, publish, and process trusted information, such as government portals, public broadcasters, newsrooms, emergency alert systems, and major communication platforms. These systems are not just administrative tools: they help shape public understanding, coordinate services, and maintain confidence during normal operations and crises.
In cyber security, this term matters because attackers often target information infrastructure to influence behavior rather than to steal data. Disinformation, account compromise, website defacement, and coordinated amplification can all disrupt trust in official messages or media coverage. Defenders protect these assets with strong authentication, content integrity controls, monitoring for abnormal publishing patterns, and rapid incident response. The goal is not only to keep systems online, but also to preserve the reliability of the information they deliver.