What is required for all Unclassified DoD data at rest that is not public?

• A. Regular backups
• B. Network authentication
• C. Encryption
• D. Firewall protection

Answer: (C)

For all Unclassified Department of Defense (DoD) data at rest that is not public, encryption is a crucial requirement. This is because encryption serves to protect sensitive information from unauthorized access and ensures its confidentiality. By encoding the data, even if someone gains physical access to the stored data, they would not be able to read it without the appropriate decryption keys.

Encryption is part of the broader security measures needed to safeguard data, and it helps comply with various regulations and standards regarding information security. It prevents data breaches and mitigates potential risks associated with storing sensitive information, which could be detrimental if exposed.

While regular backups, network authentication, and firewall protection are important aspects of a comprehensive security strategy, they do not specifically address the need to protect data at rest against unauthorized access as effectively as encryption does. Therefore, encryption stands out as the necessary measure for safeguarding unclassified but sensitive DoD data that requires protection from unauthorized access.