Air-Gapped RF Sensor for Cyber Tampering Detection
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Solution Overview
Problem
Current methods for detecting tampering with computing systems are limited in precision, range, and applicability, and often require substantial a priori knowledge, are invasive, and susceptible to cyber threats, especially in devices lacking onboard resources to detect cyber intrusions or physical changes.
Innovation Solution
An air-gapped radio frequency (RF) sensor system, known as the ATAMP system, uses analog domain detection to identify tampering through RF emissions, providing real-time alerts and detecting changes in device performance without being susceptible to cyber-attacks, by employing antennas, RF front-end circuitry, and processing circuitry that are isolated from the target device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software-based intrusion detection is used, then cyber intrusions can be detected, but devices lacking computational resources cannot detect or prevent malicious codes
Solution Approach 1:
The patent replaces software-based detection mechanisms with hardware-based RF emission analysis. The system uses RF sensors to detect electromagnetic emissions from device components, enabling intrusion detection through physical signal analysis rather than computational software processing. This substitution allows resource-constrained devices to be monitored without requiring onboard computational resources for malware detection.
Solution Approach 2:
The patent introduces an intermediary RF sensing system that monitors device emissions without directly interacting with the target device's software or hardware components. The RF sensor acts as a mediator, detecting tampering through electromagnetic radiation patterns, thereby enabling detection capability in devices that lack native security resources while maintaining independence from the monitored system.
2Speed
If RF sensor system components are integrated into the target device, then real-time detection is achieved, but the system becomes susceptible to cyber-attacks
Solution Approach 1:
The patent extracts the RF sensor system components (antennas, RF front-end circuitry, processing circuitry) from the target device's integrated circuitry, creating an air-gapped monitoring system. These components are physically separated and electrically isolated from the monitored device, allowing real-time RF emission analysis while preventing cyber-attacks from propagating to the detection system itself.
Solution Approach 2:
The patent creates an inert, isolated environment for the RF sensor system through air-gapping. The processing circuitry operates in electrical isolation from the target device, similar to how an inert atmosphere protects against chemical reactions. This isolation ensures that even if the target device is compromised, the detection system remains protected from cyber-attacks and can continue monitoring independently.
3Measurement precision
If multiple RF signals are transmitted to illuminate the target device, then mixed RF signals are generated for analysis, but the system complexity increases
Solution Approach 1:
The patent employs periodic transmission of multiple RF illumination signals at different frequencies and time intervals. This periodic action creates distinct mixed RF signal patterns that can be analyzed for tampering detection. The time-varying nature of the signals allows the system to distinguish between normal device emissions and tampering-induced anomalies through pattern recognition.
Solution Approach 2:
The patent designs the RF illumination system to serve multiple functions: transmitting signals at different frequencies, creating mixed signals for analysis, and enabling various detection modes (cyber tampering, physical tampering, performance monitoring). This multi-functionality reduces overall system complexity by consolidating multiple detection capabilities into a single RF signal transmission framework.
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
The ATAMP system effectively detects cyber and physical tampering, malware, and predicts future device failures or sub-standard performance in devices lacking onboard resources, offering real-time notifications and air-gapped security, thus enhancing computing device security and reliability.
Implementation Method 1
uses emissions from a system to determine its operation, behavior, or state
Data Source
AI summary
An analog tamper-detection apparatus (ATAMP) for onboard analysis of a target device includes a plurality of antennas, each antenna of the plurality of antennas disposed within the target device and being electrically isolated from components of the target device. The ATAMP device further includes radio frequency (RF) front-end (RFFE) transmitter circuitry coupled to the plurality of antennas, the RFFE transmitter circuitry configured to illuminate the target device with a plurality of electromagnetic signals emitted via the plurality of antennas, to generate a plurality of mixed RF signals. The ATAMP device further includes RFFE receiver circuitry configured to receive emissions from the target device based on the mixed RF signals, and processing circuitry configured to perform subsequent analysis and evaluation of the target device based on the received emissions. The processing circuitry further generates a notification of the subsequent analysis and evaluation.