Silver Halide PCBA X-Ray Detection for Data Protection
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Solution Overview
Problem
Current radiopaque materials used for protecting cryptographic hardware from X-ray imaging and damage caused by X-ray exposure are impractical and expensive, and lack the ability to detect X-rays effectively.
Innovation Solution
Incorporating silver halide grains, encapsulated in microcapsules or suspended in a carrier medium, into printed circuit board assemblies (PCBAs) to detect changes in electrical properties caused by X-ray exposure, triggering data protection responses such as data deletion or alert generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current radiopaque materials are used for protecting cryptographic hardware, then protection from X-ray imaging is provided, but the materials are impractical and expensive
Solution Approach 1:
The patent replaces expensive, impractical radiopaque materials with a cost-effective silver halide-based detection system. The silver halide grains are embedded in conventional PCBA materials (epoxy, silicone, polyimide), creating an affordable protective layer that detects X-ray exposure through electrical property changes rather than relying on costly radiopaque substances.
Solution Approach 2:
The patent substitutes the passive mechanical/radiological approach of radiopaque materials with an electrical detection system. Instead of using materials that physically block or indicate X-ray exposure through density, the system uses silver halide grains that undergo photochemical changes detectable by electrical property monitoring, replacing a material-based solution with a sensor-based approach.
2Reliability
If current radiopaque materials are used, then protection from X-ray damage is provided, but they lack the ability to detect X-rays effectively
Solution Approach 1:
The patent implements a feedback mechanism where the monitoring component continuously measures electrical properties of the PCBA and compares them against baseline values. When X-ray exposure causes silver halide decomposition and conductivity changes, the system detects these variations and triggers appropriate responses (alerts, data protection), creating a closed-loop detection and response system that actively monitors for X-ray damage.
Solution Approach 2:
The patent introduces silver halide grains as an intermediary substance between the X-ray radiation and the electronic monitoring system. The silver halide acts as a transducer that converts invisible X-ray exposure into measurable electrical property changes through photochemical decomposition, enabling indirect detection of radiation that would otherwise be undetectable by electronic components.
3Difficulty of detecting and measuring
If silver halide grains are incorporated into PCBA, then detection of X-ray exposure is enabled, but additional components and processing are required
Solution Approach 1:
The patent merges the X-ray detection function with existing PCBA structures by embedding silver halide grains within conventional materials like epoxy, silicone, or polyimide that are already part of the circuit board assembly. The monitoring component leverages existing electrical measurement capabilities of the PCBA, combining multiple functions (structural support, radiation detection, electrical monitoring) into an integrated system rather than adding separate discrete components.
Solution Approach 2:
The patent creates a multi-functional system where the PCBA serves both its original electronic function and X-ray detection function simultaneously. The silver halide-containing material provides both structural/protection functions and radiation sensing capabilities, while the monitoring component uses the same electrical measurement infrastructure for both operational monitoring and radiation detection, maximizing utility of existing components.
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 solution provides effective detection of X-ray exposure and mitigation of damage by automatically enacting data protection measures, enhancing the security and reliability of cryptographic hardware without the need for expensive radiopaque materials.
Implementation Method 1
silver halide grains...detect changes in electrical properties caused by X-ray exposure
Implementation Method 2
silver halide grains...detect changes in electrical properties caused by X-ray exposure
Data Source
AI summary
A method, printed circuit board assembly (PCBA), and device comprising a PCBA are disclosed. The method includes obtaining a material comprising silver halide grains, incorporating the material into a PCBA having at least one component in contact with the material, detecting a variation in electrical properties of the at least one component that is above a threshold variation and, in response, enacting a data protection response. The PCBA includes a material comprising silver halide grains, at least one component in contact with the material, and a monitoring component. The monitoring component is configured to detect a variation in electrical properties of the at least one component that is above a threshold variation and, in response, enact a data protection response.