What is the first step in managing a classified information security incident?

The first step in managing a classified information security incident is immediate reporting to authorities. This action is critical because prompt communication ensures that the proper entities are informed and can start taking necessary actions to mitigate the situation. Reporting allows for a quick assessment of the incident's severity and initiates a coordinated response, which might include investigating the breach and implementing containment strategies. Furthermore, involving authorities quickly can help in gathering evidence, preventing further unauthorized disclosures, and ensuring compliance with legal and regulatory requirements.

While documentation, executing a response plan, and assessing potential damage are important steps that follow immediate reporting, they rely on the foundational action of notifying the relevant authorities to guide the subsequent response actions effectively. This ensures a thorough and organized approach to incident management, minimizing risks associated with the breach of classified information.