How do classified information and Controlled Unclassified Information (CUI) differ?

Classified information and Controlled Unclassified Information (CUI) serve different purposes in the realm of information security. The key distinction lies in the level of sensitivity and the protection measures required.

Classified information is information that, if disclosed without authorization, could cause damage to national security. This type of information is categorized into different levels (such as Confidential, Secret, and Top Secret) and is subject to stringent protection measures, including specific access controls, handling procedures, and personnel security requirements. The need for national security protection is crucial because unauthorized disclosure could have serious implications for the safety and interests of the nation.

In contrast, Controlled Unclassified Information refers to information that is not classified but still requires safeguarding or dissemination controls as mandated by law, regulation, or government-wide policy. While CUI does not require the same level of protection as classified information, it is not necessarily public. It has specific handling requirements that aim to protect sensitive information that, while not classified, still requires protection to avoid potential risks.

Thus, the correct answer emphasizes that classified information is unique because it necessitates national security protection, distinguishing it from CUI and emphasizing the level of concern associated with unauthorized disclosure of classified materials.