Ring Oscillator Sensor for Integrated Circuit Tampering Detection
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Solution Overview
Problem
Current methods fail to effectively detect and prevent tampering, stressing, and replacement of integrated circuits, which can compromise security and authenticity, especially in electronic devices relying on non-volatile memory for programming information.
Innovation Solution
A system employing a sensor with a ring oscillator and sensory circuitry that detects changes in frequency based on controlled access to an integrated circuit's memory, using a discrimination matrix of electrical interface signals to identify unique characteristics and distinguish between seemingly identical devices, implemented in Programmable Logic Devices (PLDs) or microprocessor-based circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical contact methods are used to detect tampering, then detection capability is improved, but false positives increase and stealth is reduced
Solution Approach 1:
The patent replaces physical contact-based detection methods with electromagnetic field-based detection using a ring oscillator sensor. The sensor detects changes in the integrated circuit's electrical characteristics through electromagnetic coupling without requiring physical contact, thereby maintaining detection capability while reducing false positives and preserving stealth.
Solution Approach 2:
The ring oscillator acts as an intermediary between the detection system and the integrated circuit. It couples electromagnetically to the circuit's memory device, translating electrical characteristic changes into measurable frequency variations without direct physical contact, thus improving reliability while maintaining detection precision.
2Ease of operation
If traditional authentication methods are used, then ease of operation is improved, but security against tampering and replacement is worsened
Solution Approach 1:
The integrated circuit's memory device itself serves as the authentication source. The ring oscillator utilizes the memory device's inherent electrical characteristics (capacitance, impedance) to generate a unique frequency signature, eliminating the need for separate authentication components while enhancing security against tampering and replacement.
Solution Approach 2:
The system authenticates by measuring changes in electrical parameters (frequency, capacitance, impedance) of the memory device rather than relying on traditional static authentication methods. These parameter changes provide a unique fingerprint for each circuit, maintaining ease of operation while significantly improving security against tampering and replacement.
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
This approach allows for the detection of tampering without physical contact, reduces false positives, and provides a stealthy method to authenticate integrated circuits, ensuring the integrity of programming information and preventing unauthorized access or replacement.
Implementation Method 1
the frequency of the ring oscillator is a direct function of Address/Data pairs of the memory device of the integrated circuit and Address bits of the memory device are held constant and frequency of oscillation resulting from the ring oscillator is a function of the propagation delay and impedance of the Address bits and Data bits accessed under control of a control function
Implementation Method 2
frequency of oscillation resulting from the ring oscillator is a function of the propagation delay and impedance of the Address bits and Data bits
Data Source
AI summary
A system employs physical unclonable functions of an integrated circuit for detecting integrated circuits and protecting products and technology from integrated circuits which have been subject to tampering, stressing and replacement, and counterfeit components. The system includes a sensor detecting a characteristic impedance generated as a result of controlled access to a memory device of the integrated circuit. The characteristic impedance is applied in the creation of a discrimination matrix of values based on electrical interface signals for the integrated circuit. The sensor includes a ring oscillator and associated monitoring components. The ring oscillator is composed of the memory device of the integrated circuit and a sensory circuitry, wherein changes in a frequency generated by the ring oscillator is indicative of changes in circuitry.