Which of the following is a direct threat to the security of radio communications?

• A. Interception of signals
• B. Lightning
• C. Observation by others
• D. Weather conditions

Answer: (A)

Direct threats to radio communications security come from any activity that gives someone unauthorized access to the content being transmitted. Interception of signals is the act of capturing and listening to or decoding the transmitted information without permission, which directly compromises confidentiality and the overall security of the communication. Weather and lightning can disrupt or degrade the signal, affecting availability and reliability, but they don’t give someone unauthorized access to the message itself. Observation by others might pose other risks, such as revealing operational details or locations, but it doesn’t by itself constitute accessing the content of the transmission.