Mirror

Sealed by mutual disclosure

Two halves, two holders. Neither opens alone — both must combine to unlock. Built for hostage-style exchanges where neither party should reveal first.

1. What to seal

2. Holders

Each holder receives one half of the key by email. Neither half on its own decrypts anything — both must be combined in the same browser session to unlock.

XChaCha20-Poly1305 · Shamir 2-of-2 · No server-held halves