External Coupling Circuit for Electromagnetic Individual Determination
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Solution Overview
Problem
Conventional methods for individual determination of electronic or electrical equipment require a dedicated circuit with a physically unclonable function (PUF), which is not feasible without adding a special circuit to the target equipment.
Innovation Solution
An individual determination device that uses a coupling circuit to detect electromagnetic characteristics from conduction noise, extracts and outputs individual characteristic signals, and compares them with stored data to perform authenticity or identification without adding a special circuit to the target equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated circuit with PUF is disposed inside the target equipment to perform individual determination, then individual determination capability is achieved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent extracts the individual determination function from the target equipment itself and places it in an external determination device. The target equipment's inherent electromagnetic characteristics are measured and used for determination without requiring any special circuits inside the equipment, thus eliminating the need to embed complex PUF circuits while maintaining determination capability.
Solution Approach 2:
The patent introduces an external determination device as an intermediary between the target equipment and the determination function. This intermediary device measures electromagnetic characteristics from the equipment's interfaces and performs individual determination, avoiding the need to modify or add circuits to the target equipment itself.
2Reliability
If a dedicated circuit with PUF is disposed inside the target equipment to perform individual determination, then individual determination capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent removes the expensive PUF circuit requirement from the target equipment by extracting the determination function to an external device. This allows standard, cost-effective equipment to be manufactured without adding expensive identification circuits, while still enabling individual determination through measurement of inherent electromagnetic characteristics.
Solution Approach 2:
The patent enables the target equipment to serve itself by utilizing its own inherent electromagnetic characteristics as the identification basis. No external special circuits or expensive components are needed inside the equipment - its natural electromagnetic signature is measured and used for determination, reducing manufacturing costs.
3Reliability
If a dedicated circuit with PUF is disposed inside the target equipment, then individual determination can be performed, but the operation of the equipment may be affected
Solution Approach 1:
The patent extracts the determination function from inside the equipment to an external device, ensuring that no special circuits are disposed inside the target equipment. This maintains the equipment's original operation characteristics while enabling individual determination through external measurement of electromagnetic characteristics.
Solution Approach 2:
The external determination device acts as an intermediary that measures electromagnetic characteristics from the equipment's interfaces without interfering with the equipment's internal operation. This allows determination to be performed while the equipment operates normally, as the measurement interface does not disrupt internal circuits or operations.
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
Enables individual determination of target equipment using inherent electromagnetic characteristics, eliminating the need for a dedicated circuit and ensuring the operation of the equipment remains unaffected.
Implementation Method 1
a coupling circuit that is electrically connected to an interface in target equipment, the coupling circuit being configured to detect a signal showing an electromagnetic characteristic based on a conduction noise that is conducted to the interface in target equipment
Data Source
AI summary
An individual determination device for target equipment, includes: a coupling circuit electrically connected to an interface in target equipment, and to detect a signal showing an electromagnetic characteristic from target equipment, to extract an electromagnetic characteristic signal showing an individual characteristic of the target equipment, from the conduction noise detected thereby, and to output the electromagnetic characteristic signal; a characteristic measurement device to receive the electromagnetic characteristic signal from the coupling circuit, and to output individual characteristic data showing the individual characteristic of the target equipment on a basis of the electromagnetic characteristic signal; a storage device to store individual characteristic data showing an electromagnetic individual characteristic of original target equipment; and a comparison and determination device to compare the individual characteristic data from the characteristic measurement device and the individual characteristic data stored in the storage device, and to perform individual determination on the target equipment.