How many Shamir's key shares are required to unseal a Vault instance?

Requiring all key shares would make the system too brittle, as the loss of a single share would prevent unsealing.

While a quorum generally implies a minimum number, in Shamir's Secret Sharing context for Vault, the specific term is 'threshold' and refers to the minimum number of shares required.

One or more keys is insufficient; a specific minimum number, the threshold, is necessary to reconstruct the master key.

Vault uses Shamir's Secret Sharing to split the master key into multiple shares. The `threshold` number of these shares, configured during Vault initialization, must be provided to reconstruct the master key and unseal the Vault instance.