Scheme like Shamir's Secret Sharing [1] allow you to split a secret between multiple people, and also set how many people are needed to reconstruct the secret.

Scheme like Shamir's Secret Sharing [1] allow you to split a secret between multiple people, and also set how many people are needed to reconstruct the secret. For instance, you could share it with 5 people, and only require 3 to reconstruct the secret. [1] http://point-at-infinity.org/ssss/ http://point-at-infinity.org/ssss/