Physical-layer auditing with diodes, photodiodes, and magnetic field detection

Short summary

Part of a series on physical-layer auditing, this article introduces diodes, photodiodes, and magnetic fields as tools for detecting hidden system activity during audits. It explains how physical emissions and magnetic anomalies can reveal tampering or hidden devices that software logs miss. The content is introductory and conceptual, lacking concrete implementation details or tool recommendations.

• •Diodes control current flow; photodiodes detect light emissions from systems
• •Magnetic field anomalies can reveal hidden activity or tampering not visible in software logs
• •Article is conceptual and introductory, part of a broader series on physical audits

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