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Authorized use only. Use this tool solely on systems, tokens, and assets you own or are explicitly permitted to test — credential extraction, signature forging, and unauthorized access are prohibited by our Acceptable Use Policy.

Shamir Secret Sharing

Split a secret into N shares — any 3 of 5 reconstructs it

Your secret is split locally using GF(257) arithmetic. Nothing is transmitted.

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About the Shamir Splitter

Shamir's Secret Sharing splits a secret into N shares, any K of which reconstruct it — with fewer than K shares revealing nothing, mathematically. It is how seed phrases and recovery keys get stored across locations without any single point of failure.

This tool performs the split and combine over GF(257) with a live polynomial visualization: drag shares on the curve and watch why two points cannot reveal a cubic. Split test values locally — and only test values; real secrets belong in air-gapped tools.

How to use

  1. Enter a secret, choose N shares and threshold K.
  2. Distribute the shares (the demo shows the polynomial).
  3. Combine any K shares to reconstruct; try fewer to see it fail.