Hackers' Pub

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jaseg @jaseg@chaos.social

10/21/2025, 9:43:18 AM

Public

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

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.

The sampling edges as measured by the board itself. As you can see, using a cheap microcontroller and some cheap display signal redriver ICs along with commodity RF schottkies you can get pretty spicy edges on a budget.

If you have a fediverse account, you can quote this note from your own instance. Search https://chaos.social/users/jaseg/statuses/115411504259693224 on your instance and quote it. (Note that quoting is not supported in Mastodon.)