Power Line Firewall for Blocking Data Exfiltration Signals
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Solution Overview
Problem
Air-gapped computing systems are vulnerable to data exfiltration through their power supply infrastructure, where malicious signals can be extracted from power conductors without direct contact, posing a significant security risk as attackers can use inexpensive equipment to detect and record these signals, making it challenging to secure sensitive data.
Innovation Solution
A power line firewall or filter system that cancels or alters electrical signals on power supply conductors and earthing conductors, preventing signal exfiltration by reshaping fundamental and non-fundamental frequency waveforms, and optionally detecting and reporting anomalous signals, deployed between the power source and the computing devices to minimize signal transmission and exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air-gapped systems are used to isolate computing devices from networks, then data security is improved, but vulnerability to power line signal extraction attacks increases
Solution Approach 1:
A power line firewall device is introduced as an intermediary component between the power source and the air-gapped computing device. This mediator actively monitors and blocks malicious signals on the power line while allowing normal power transmission, thereby maintaining both the security benefits of air-gapping and protecting against power line extraction attacks
Solution Approach 2:
The system converts the inherent electrical signals present on power lines (which could be used for malicious extraction) into beneficial security monitoring opportunities. By detecting and analyzing these signals, the system can identify and block malicious transmissions while using the same power infrastructure for security purposes
2Object-affected harmful factors
If power line filtering is applied to block signal transmission, then signal exfiltration is prevented, but power delivery efficiency may be affected
Solution Approach 1:
The power line firewall employs dynamic signal processing that adapts in real-time to the electrical characteristics of the connected device. The filtering parameters are continuously adjusted based on detected signal patterns, allowing the system to maintain effective blocking of malicious signals while optimizing power transmission efficiency under varying load conditions
Solution Approach 2:
The system dynamically changes electrical parameters (such as impedance matching and filtering thresholds) based on the operational state of the connected device. By monitoring power consumption patterns and signal characteristics, the firewall adjusts its parameters to minimize power loss while maintaining effective signal blocking
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents data exfiltration by eliminating detectable signals on power lines, reducing the risk of unauthorized data access and enhancing the security of air-gapped systems by minimizing signal transmission and detection vulnerabilities.
Implementation Method 1
an inductor coupled in series with each of the one or more conductors, wherein an inductance of each inductor increases when current at frequencies greater than a nominal frequency flows through the inductor
Data Source
AI summary
The disclosed embodiments relate to method and/or device which is effective at cancelling or altering electrical signals or pulses, generated by, for example, digital electronic systems and components, that are induced, reflected or otherwise made present on the mains power supply conductors and/or the earthing or grounding conductor (if present.) The disclosed embodiments cancel these electrical signals thereby providing an effective means of preventing the exfiltration of various data from a computing or similar system by means of power line emissions. The disclosed embodiments may perform this subjugation by: altering the shape of the fundamental current and voltage waveforms and also altering and diminishing any non-fundamental frequency waveforms to a point where they are no longer measurable or detectable; and preventing the communication via inductive coupling of any electrical signals on mains current onto the grounding path or vice versa.