Anti-Tamper Circuitry for Unauthorized Component Detection

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Solution Overview

Problem

Third-party suppliers can swap unauthorized components in systems, leading to performance issues and potential damage, particularly in medical imaging systems like CT and x-ray systems, by installing used or broken components that mimic genuine ones, compromising image quality and patient safety.

Innovation Solution

Incorporation of anti-tamper circuitry in devices that disables functionality when removed from their designated components, using mechanisms such as sealed housings, switches, and erasure of memory to prevent unauthorized reuse, and detection through RFID, light sensors, and tamper-resistant mounting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If anti-tamper circuitry is added to detect unauthorized components, then system reliability is improved, but device complexity increases

Engineering Contradiction:

Improvesystem reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-programming authorized component identifiers into the system memory before operation. When a component is installed, the system immediately checks its identifier against the authorized list. This proactive verification approach ensures unauthorized components are detected before they can cause harm, improving reliability without requiring complex real-time monitoring mechanisms.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces complex mechanical tamper-detection mechanisms with electronic identifier verification. Instead of using physical seals, switches, or mechanical locks that would increase device complexity, the system uses software-based authentication where components present digital identifiers that are verified against authorized lists stored in memory. This substitution significantly reduces hardware complexity while maintaining high reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If physical access is restricted to disarm anti-tamper circuitry, then unauthorized reuse is prevented, but ease of operation deteriorates

Engineering Contradiction:

Improveprevention of unauthorized reuseVSAvoidease of operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent introduces an intermediary authentication mechanism that mediates between security requirements and operational convenience. Instead of requiring physical access to disarmed circuitry or complete system shutdowns, the system uses an intermediate software authentication layer. Authorized users can verify their credentials and disarm the anti-tamper circuitry through authenticated software commands, eliminating the need for physical tampering while maintaining security. This intermediary approach preserves ease of operation for authorized personnel while preventing unauthorized access.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12400040B2Detection of unauthorized components

Publication Date: 2025.08.26 VAREX IMAGING CORP

AI summary

Embodiments include a method, comprising: receiving from a first device at a second device, a request for a system identifier (ID) stored on the second device; and determining, by the second device, if the system ID stored on the second device has an empty value; when the system ID stored on the second device does not have the empty value, transmitting, by the second device to the first device, a response based on the system ID stored on the second device.