Which classification type prohibits the sharing of information without authorization?

The classification type that prohibits the sharing of information without authorization is classified information. This type of information is deemed sensitive and is protected under various regulations and laws to safeguard national security. Access to classified information is strictly controlled and is limited to individuals who have the appropriate security clearance and a legitimate need to know. Unauthorized disclosure of classified information can have severe implications for national security and can lead to legal consequences for the individual involved.

In contrast, unclassified information does not have restrictions on sharing and can be freely disseminated. Controlled Unclassified Information (CUI) is a category that includes sensitive but unclassified data that still requires protection, and while it has restrictions, it does not carry the same legal weight as classified information. For Official Use Only (FOUO) is also a designation intended for information that is sensitive but not classified, allowing some sharing limits, though it is not as stringent as classified information protocols.