Capacitor-Array PUF Fingerprint for Counterfeit Component Authentication

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Solution Overview

Problem

Components in supply chains are susceptible to manipulation and integration of counterfeit parts, which can compromise product quality and security, necessitating improved techniques for tracking component provenance and identifying counterfeit components.

Innovation Solution

A physically unclonable function (PUF) device utilizing a capacitor array with randomly valued capacitors, coupled to an electronic device, generates a unique digital fingerprint through driver and receiver circuits, which is unaffected by aging, temperature, and power supply variations, making it impractical to clone or alter the fingerprint.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional tracking methods are used to monitor component provenance, then the system is simple to implement, but the system is vulnerable to counterfeiting and manipulation

Engineering Contradiction:

Improvecomponent provenance tracking reliabilityVSAvoidanti-counterfeiting system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The PUF device generates its own unique digital fingerprint automatically through the random capacitance values inherent in the capacitor array, without requiring external programming or manual configuration. The device self-authenticates by producing fingerprints based on its physical characteristics, eliminating the need for complex external authentication infrastructure.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces traditional mechanical or electronic tracking tags (like RFID or barcodes) with a physics-based PUF system that uses random capacitance variations in a capacitor array. This substitution creates an unclonable digital fingerprint based on physical properties rather than programmable data, making counterfeiting impractical.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If a secure authentication system is implemented to prevent counterfeiting, then the security is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvedevice authentication securityVSAvoidPUF device manufacturing ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent leverages natural variations in capacitance parameters of the capacitor array elements to create unique fingerprints. These parameter variations arise from inherent manufacturing tolerances and physical properties of the dielectric material and conductive elements, meaning no additional manufacturing steps are required beyond standard capacitor fabrication processes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of trying to prevent copying through complex security measures, the system embraces the copying problem by creating an unclonable physical fingerprint. The random capacitance values make it impossible to replicate the exact fingerprint, as each capacitor array is physically unique due to variations in dielectric permittivity and conductor geometry.

Inventive Principle:

Principle #26Copying

3Measurement precision

If environmental factors like temperature and aging are considered in fingerprint stability, then the accuracy is improved, but the system complexity increases

Engineering Contradiction:

Improvefingerprint measurement accuracyVSAvoidcompensation mechanism complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent converts the harmful effects of temperature variations and aging into beneficial features. By using ratios of capacitance values rather than absolute values, the system makes these environmental factors cancel out, as they affect all capacitors similarly. This transforms potential sources of error into a robustness feature that enhances fingerprint stability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The system changes from measuring absolute capacitance values to measuring ratios of capacitance values. This parameter transformation eliminates the need for complex compensation mechanisms, as the ratio calculation inherently compensates for environmental factors that affect all capacitors uniformly, simplifying the overall system while improving accuracy.

Inventive Principle:

Principle #35Parameter changes

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 PUF device provides a secure, unique digital signature for authenticating electronic devices, ensuring the integrity of the product and preventing unauthorized modifications by rendering counterfeiting impractical.

Implementation Method 1

a plurality of parallel conductive elements coupled to a dielectric material having a spatially varying permittivity to define array of randomly valued capacitors

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

a dielectric material having a spatially varying permittivity

Methodology Applied

Scientific EffectDielectric permittivity: Dielectric Permittivity

Data Source

PatentUS12581957B2Anti-counterfeiting fingerprint

Publication Date: 2026.03.17 RAYTHEON CO

AI summary

A physically unclonable function (PUF) device includes capacitor array couple to an electronic device. The capacitor array includes a plurality of parallel conductive elements coupled to a dielectric material having a spatially varying permittivity to define array of randomly valued capacitors.