https://github.com/systemslibrarian/crypto-lab-shamir-gate
https://github.com/systemslibrarian/crypto-lab-shamir-gate
Last synced: 1 day ago
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- Host: GitHub
- URL: https://github.com/systemslibrarian/crypto-lab-shamir-gate
- Owner: systemslibrarian
- Created: 2026-04-06T12:59:25.000Z (about 2 months ago)
- Default Branch: main
- Last Pushed: 2026-04-06T13:42:08.000Z (about 2 months ago)
- Last Synced: 2026-04-06T15:34:43.941Z (about 2 months ago)
- Language: Shell
- Size: 32.2 KB
- Stars: 0
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# crypto-lab-shamir-gate
## What It Is
Browser-based Shamir's Secret Sharing demo covering the complete protocol:
polynomial construction over GF(p), Lagrange interpolation with step-by-step
visualization, information-theoretic security proof (t-1 shares reveal zero
information), AES-256-GCM encryption with split key, and real-world deployments
in HSMs, FROST threshold signatures, and CA key ceremonies.
All arithmetic uses BigInt over a prime field. No floating point approximations.
The polynomial visualization shows what under-threshold shares actually mean —
multiple valid polynomials consistent with the same shares, each reaching a
different secret — making the security guarantee tangible rather than abstract.
## When to Use It
- Distributing a secret across multiple custodians with a threshold requirement
- Understanding why FROST, MPC, and HSM key ceremonies work
- Teaching the difference between computational security (RSA, AES) and
information-theoretic security (Shamir — secure even against infinite compute)
- Splitting an AES-256 key across administrators for high-assurance systems
## Live Demo
https://systemslibrarian.github.io/crypto-lab-shamir-gate/
## How to Run Locally
```
git clone https://github.com/systemslibrarian/crypto-lab-shamir-gate
cd crypto-lab-shamir-gate/demos/shamir-gate
npm install
npm run dev
```
## Part of the Crypto-Lab Suite
One of 70+ browser demos at systemslibrarian.github.io/crypto-lab/ — spanning
Atbash (~600 BCE) through NIST FIPS 203/204/205 (2024). Shamir (1979) sits in
the secret-sharing tier alongside crypto-lab-frost-threshold, crypto-lab-vss-gate,
and crypto-lab-silent-tally.