The fifth line must contain?

The fifth line must contain?

• A. A phone number or office mailbox for the originating DoD Component or authorized CUI holder.
• B. The DoD Component's physical address.
• C. A digital encryption key.
• D. The document's creation date.

Answer: (C)

Access to CUI must be protected through encryption, so the line in the document’s packaging that signals how to unlock the content is the one that carries the digital encryption key. The key is what actually enables an authorized user to decrypt and read the information, making it the mechanism that controls who can access the contents. Without the key, even trusted recipients cannot view the document, which is why this line is essential. The other options would not provide access to the content: a phone number or mailbox only identifies the origin or point of contact, a physical address has no role in decryption, and the creation date does not affect who can read the information. The encryption key directly relates to being able to access the protected material. In practice, keys should be transmitted securely, but the line in this context is what indicates the decryption method.

Access to CUI must be protected through encryption, so the line in the document’s packaging that signals how to unlock the content is the one that carries the digital encryption key. The key is what actually enables an authorized user to decrypt and read the information, making it the mechanism that controls who can access the contents. Without the key, even trusted recipients cannot view the document, which is why this line is essential.

The other options would not provide access to the content: a phone number or mailbox only identifies the origin or point of contact, a physical address has no role in decryption, and the creation date does not affect who can read the information. The encryption key directly relates to being able to access the protected material. In practice, keys should be transmitted securely, but the line in this context is what indicates the decryption method.