Shamir's Secret Sharing Online | Split & Recover Secrets Securely

Shamir's Secret Sharing

Split secrets into multiple shares and reconstruct them securely. Perfect for crypto wallet keys, passwords, and multi-person authorization.

Threshold Cryptography

Generate Shares

Split Secret

Total number of shares to generate

Minimum shares needed to recover

Generated shares will appear here...

Recover Secret

Reconstruct

What is Shamir's Secret Sharing?

Shamir's Secret Sharing (SSS) is a cryptographic algorithm created by Adi Shamir in 1979. It allows you to split a secret into multiple parts (shares) in such a way that a minimum number of shares (threshold) are required to reconstruct the original secret.

🔐 Threshold Security

With k-of-n threshold, any k shares can recover the secret, but k-1 shares reveal nothing.

📊 Information-Theoretic Security

Mathematically proven to be unconditionally secure, not dependent on computational assumptions.

💼 Enterprise Use Cases

Perfect for multi-person authorization, disaster recovery, and key escrow systems.

🔑 Crypto Wallet Backup

Securely distribute your seed phrase among trusted parties or locations.

Security Note: All processing happens in your browser. Your secret is never transmitted to any server. For maximum security, use this tool offline.

How It Works

The algorithm uses polynomial interpolation in a finite field. The secret is the constant term of a random polynomial, and each share is a point on that polynomial.

// Example: 3-of-5 Shamir Secret Sharing // Secret: "MyPassword123" // Generated shares: Share 1: 801a2b3c4d5e6f7... Share 2: 802a3b4c5d6e7f8... Share 3: 803a4b5c6d7e8f9... Share 4: 804a5b6c7d8e9fa... Share 5: 805a6b7c8d9eafb... // Any 3 shares can recover "MyPassword123" // Any 2 shares reveal NOTHING about the secret

Common Use Cases

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