Doubly-encrypted secret parts allowing for assembly of a secret using a subset of the doubly-encrypted secret parts

1. A system comprising:

at least one processor;

at least one memory communicatively coupled to the at least one processor;

wherein the at least one processor is configured to:

receive a plurality of doubly-encrypted secret parts that were encrypted using at least a public key belonging to a public/private keypair, wherein each of the plurality of doubly-encrypted secret parts are distributed to and received from a respective part holder of a plurality of part holders;

decrypt each of the plurality of doubly-encrypted secret parts into a corresponding singly-encrypted secret part using a private key belonging to the public/private keypair; and

decrypt each corresponding singly-encrypted secret part into a corresponding secret part by exclusive ORing (XORing) each corresponding singly-encrypted secret part with at least one corresponding symmetric key to produce the corresponding secret part;

wherein a secret is reconstructed from two or more corresponding secret parts that are a subset of a total number of secret parts previously created from the secret.

2. The system of claim 1 , wherein each doubly-encrypted secret part was encrypted into the corresponding singly-encrypted secret part using the at least one corresponding symmetric key.

3. The system of claim 2 , wherein at least one first corresponding symmetric key for a first secret part is identical to at least one second corresponding symmetric key for a second secret part.

4. The system of claim 2 , wherein at least one first corresponding symmetric key for a first secret part is distinct from at least one second corresponding symmetric key for a second secret part.

5. The system of claim 1 , wherein the plurality of doubly-encrypted secret parts were encrypted using two stages, comprising:

a first stage during which each corresponding secret part was encrypted into the corresponding singly-encrypted secret part using a symmetric key or a second public key belonging to a second public/private keypair; and

a second stage during which each corresponding singly-encrypted secret part was encrypted into a respective doubly-encrypted secret part of the plurality of doubly-encrypted secret parts using the public key belonging to the public/private keypair.

6. The system of claim 1 , wherein the at least one processor is further configured to perform at least one of the following actions using the secret:

encrypting first data;

decrypting second data;

generating a transaction address; or

signing a transaction.

7. The system of claim 1 , wherein, for each of the plurality of doubly-encrypted secret parts, the at least one processor is further configured to verify a respective signature associated with each of the plurality of doubly-encrypted secret parts.

8. The system of claim 1 , wherein the at least one processor is further configured to verify that a respective timestamp associated with each of the plurality of doubly-encrypted secret parts is not older than a predetermined time threshold.

9. A method for reconstructing an asset encryption key, comprising:

receiving, by at least one computing device, a plurality of doubly-encrypted secret parts that were encrypted using at least a public key belonging to a public/private keypair, wherein each of the plurality of doubly-encrypted secret parts are distributed to and received from a respective part holder of a plurality of part holders;

decrypting, by the at least one computing device, each of the plurality of doubly-encrypted secret parts into a corresponding singly-encrypted secret part using a private key belonging to the public/private keypair; and

decrypting, by the at least one computing device, each corresponding singly-encrypted secret part into a corresponding secret part by exclusive ORing (XORing) each corresponding singly-encrypted secret part with at least one corresponding symmetric key to produce the corresponding secret part;

wherein a secret is reconstructed from a quantity of two or more corresponding secret parts that is are a subset of a total number of secret parts previously created from the secret.

10. The method of claim 9 , wherein each doubly-encrypted secret part was encrypted into the corresponding singly-encrypted secret part using the at least one corresponding symmetric key.

11. The method of claim 10 , wherein at least one first corresponding symmetric key for a first secret part is identical to at least one second corresponding symmetric key for a second secret part.

12. The method of claim 10 , wherein at least one first corresponding symmetric key for a first secret part is distinct from at least one second corresponding symmetric key for a second secret part.

13. The method of claim 9 , wherein the plurality of doubly-encrypted secret parts were encrypted using two stages, comprising:

a first stage during which each corresponding secret part was encrypted into the corresponding singly-encrypted secret part using a symmetric key or a second public key belonging to a second public/private keypair; and

a second stage during which each corresponding singly-encrypted secret part was encrypted into a respective doubly-encrypted secret part of the plurality of doubly-encrypted secret parts using the public key belonging to the public/private keypair.

14. The method of claim 9 , further comprising performing at least one of the following actions using the secret:

encrypting first data;

decrypting second data;

generating a transaction address; or

signing a transaction.

15. The method of claim 9 , further comprising verifying a respective signature associated with each of the plurality of doubly-encrypted secret parts.

16. The method of claim 9 , further comprising verifying that a respective timestamp associated with each of the plurality of doubly-encrypted secret parts is not older than a predetermined time threshold.