Passive Optical Anti-Tamper System Using Light Pipes
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Solution Overview
Problem
Current anti-tamper technologies are ineffective against advanced reverse engineering techniques, as they fail to detect and prevent unauthorized access to proprietary circuit designs and encryption codes within electrical and electro-optical systems, posing risks to national and economic security.
Innovation Solution
A passive optical anti-tamper system utilizing light pipes and detectors within a chassis, which generates a tamper-event-warning signal upon detecting an increase in light levels, and optionally damages components to prevent information retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anti-tamper technologies (sealing, encryption code, mechanical switches) are used, then basic physical protection is provided, but they are ineffective against advanced reverse engineering techniques such as endoscope probing and X-ray decoding
Solution Approach 1:
The patent replaces mechanical anti-tamper mechanisms (seals, switches) with an optical detection system using light pipes and photodetectors. This substitution enables detection of tampering events that mechanical systems cannot detect, such as drilling or probing, while maintaining system security without increasing mechanical complexity
Solution Approach 2:
The patent introduces light pipes as intermediary elements distributed within the chassis to detect tampering. These light pipes act as sensors that convert physical tampering attempts into detectable optical signals, providing a new layer of detection that complements existing security measures without requiring complex integration
2Loss of information
If proprietary information is protected by physical sealing and mechanical protection, then basic security is maintained, but reverse engineers can still drill holes and insert endoscope probes to view contents without detection
Solution Approach 1:
Light pipes are positioned throughout the chassis to serve as distributed sensors. When tampering occurs (drilling, probing, opening), these light pipes detect the intrusion by sensing light changes or physical disruption, converting undetectable mechanical tampering into detectable optical signals that trigger alarms
Solution Approach 2:
The patent replaces the inability to detect mechanical tampering with an optical sensing system. The light pipes and photodetectors create an optical monitoring network that can detect various tampering methods (drilling, probing, opening) that were previously undetectable, thereby improving information security
3Reliability
If military or commercial vendors use traditional protection methods, then proprietary circuits are physically protected, but undetected information leaks can occur compromising national or economic security
Solution Approach 1:
The patent implements a feedback mechanism where light detectors continuously monitor the chassis environment and provide real-time information about tampering attempts. This feedback loop enables immediate detection and alerting of security breaches, allowing military or commercial vendors to respond to threats while maintaining operational simplicity through automated monitoring
Solution Approach 2:
The optical sensor system provides self-monitoring capability within the chassis. The light pipes and detectors automatically detect and report tampering events without requiring external monitoring equipment or complex intervention, enabling security assurance while maintaining ease of operation through autonomous detection
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 detects and alerts against tampering events, ensuring the security of proprietary information by preventing unauthorized access and potential misuse of sensitive data.
Implementation Method 1
detecting an increase in light through at least one of a plurality of optical fibers within a chassis
Data Source
AI summary
A passive optical anti-tamper system including one or more light pipes, one or more light detectors and an alarm. The light pipes each include an input end and an output end and are located within a chassis with the one or more light detectors. The one or more light detectors are optically coupled to the output ends of the one or more light pipes. The alarm is operable to transmit a tamper-event-warning signal if an increased light level is detected by at least one detector.