lowRISC / lowRISC/ot-sca

[ecdsa] Try increasing sampling rate with updated firmware

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Description

Currently, we're sampling with 50 MHz and the target is running at ~5 MHz for ECDSA captures to keep a 10x oversampling ratio (some of this work is not yet in the repo). Above 50 MHz it seems the synchronization between multiple runs/segments is lost. We should re-investigate this with an updated Husky firmware.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing ECDSA captures above 50 MHz with updated Husky firmware, comparing synchronization across multiple runs and segments. Done when higher sampling rates retain synchronization while preserving the intended oversampling relationship for the approximately 5 MHz target.

Written by the indexing model from the issue text.

Assessment

Domain
cryptography, embedded-iot
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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