Power Line Signal Suppression for Air-Gap Data Exfiltration

A power line firewall device is introduced as an intermediary component between the power source and the air-gapped computing system. This device monitors and filters electromagnetic signals on power conductors, blocking data exfiltration attempts while allowing legitimate power delivery. The intermediary device includes signal detection circuitry, filtering components, and control logic to identify and suppress modulated signals that carry exfiltrated data.

The system converts the harmful electromagnetic emissions used for data exfiltration into a detectable signal pattern. By monitoring the electromagnetic environment on power conductors, the system identifies modulated signals that indicate data theft attempts. The same electromagnetic field that enables malicious communication is utilized for detection and prevention purposes, turning the attack vector into a security monitoring mechanism.

The power line firewall device performs preliminary detection and analysis of electromagnetic signals on power conductors before allowing them to propagate. The device continuously monitors signal characteristics, identifies patterns consistent with data exfiltration, and preemptively blocks suspicious transmissions. This preliminary action prevents data theft while maintaining the ability to detect and log security events for forensic analysis.

The system implements feedback mechanisms where detected electromagnetic signals are analyzed, and the results feed into control logic that adjusts filtering and blocking actions. The device provides continuous feedback about detected signal patterns, blocks identified threats, and logs security events. This closed-loop feedback system enables dynamic adaptation to different exfiltration techniques while maintaining detection capability for security monitoring and incident response.