The final setup. On the right is the measurement board, and on the left is the mesh test specimen plugged in. In a real application, you would integrate both into your target circuit.

Notices where this attachment appears

1. Embed this notice
   jaseg (jaseg@chaos.social)'s status on Friday, 24-Oct-2025 02:16:53 JST jaseg

   I've got a new paper out on eprint: Monitoring tamper-sensing meshes using low-cost time-domain reflectometry.

   In the paper, I wrote up how you can build a ~200 ps resolution time-domain reflectometer from an STM32 and some cheap display bus redriver ICs. The circuit is sensitive enough to distinguish several identical copies of the same test specimen PCB from manufacturing tolerances!

   blog post: https://jaseg.de/blog/paper-sampling-mesh-monitor/
   paper preprint: https://eprint.iacr.org/2025/1962

   #electronics #embedded #security