Which role is responsible for ensuring that information is classified?

The role responsible for ensuring that information is classified is the data owner. The data owner is typically the individual or team that has the authority and accountability for the information assets within their domain. They define the classification criteria, determine the sensitivity and importance of the information, and ensure that it is handled and protected according to its classification level.

The data owner is also responsible for making decisions about access to the data and assessing the risks associated with the information. This includes the classification of data as public, internal, confidential, or restricted based on its value to the organization and the potential impact of its exposure.

While senior management plays a crucial role in establishing policies and governance for information security, and the security manager is responsible for implementing security measures, it is ultimately the data owner who has the specific responsibility for classifying information. Similarly, the data custodian is tasked with managing and supporting the infrastructure that stores and processes the data but does not have the authority to classify it.