Question 1

What is Shamir's Secret Sharing (SSS)?

Accepted Answer

Shamir's Secret Sharing is an information-theoretic cryptographic algorithm formulated by Adi Shamir in 1979. It splits a single master secret—such as a cryptocurrency BIP-39 recovery seed phrase or master password—into N distinct shares. A predefined minimum threshold of M shares is required to reconstruct the original secret, eliminating single points of failure.

Question 2

How does M-of-N threshold recovery work in practice?

Accepted Answer

You choose how many total shares to distribute (N) and how many are strictly needed to recover your secret (M). For example, in a 3-of-5 setup, you generate 5 shares across separate safe locations. Any combination of 3 shares reconstructs the secret phrase. If 2 locations are destroyed, your secret remains 100% safe and recoverable from the remaining 3.

Question 3

Is my secret phrase uploaded to any server or cloud?

Accepted Answer

No. Never. This application operates entirely client-side inside your browser engine. All mathematical polynomial calculations, entropy generation, and QR code renderings execute directly in your local browser sandbox via the Web Cryptography API with zero telemetry.

Question 4

Is this compatible with BIP-39 Bitcoin and hardware wallet seed phrases?

Accepted Answer

Yes! The vault natively validates and supports standard 12-word, 18-word, and 24-word BIP-39 mnemonic seed phrases used by Ledger, Trezor, Keystone, Coldcard, BitBox02, and MetaMask.

SharedSecret.io – Shamir's Secret Sharing Key Manager & BIP-39 Cryptographic Vault

SharedSecret Vault