How should messages and keys be handled in field radios with encryption?

• A. Messages must be encrypted with proper keys; keys are distributed, stored securely, rotated regularly, and protected from disclosure.
• B. Messages are always transmitted in clear text; keys are optional.
• C. Keys are stored in public memory on the device for easy access.
• D. Encryption is never used in field radios.

Answer: (A)

In field radio operations, keeping communications confidential hinges on using encryption properly and managing the keys securely. Messages should be encrypted with current, authorized keys, and those keys must be distributed only to individuals who are authorized to use them. The keys themselves should be stored in secure hardware or protected storage, not left in any easily accessible location, and they should be rotated regularly so that a compromised key cannot unlock long-term traffic. Protecting the crypto material from disclosure is essential, because once a key is exposed, past and future messages can be at risk. Encryption is expected for sensitive traffic, not transmitted in the clear, and keys should not be kept in public memory or neglected. That's why this approach—encrypting messages with proper keys, secure distribution and storage, and regular key rotation—best preserves confidentiality.