Shamir&#x27;s Secret Sharing[1] seems like it would be a good mechanism to encrypt decryption keys with - you can give a part of the key to several people, and require that a certain number of them put their keys together to decrypt the information.<p>[1]: <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Shamir%27s_Secret_Sharing" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Shamir%27s_Secret_Sharing</a>