Distributed cloud storage

1. A method, comprising:

identifying, by a device of a user, a data file to be uploaded to a cloud storage of the user;

obtaining an encrypted client registry from a primary cloud provider in a plurality of cloud providers that provide cloud storage to the user, wherein the client registry comprises a key associated with the device;

decrypting the encrypted client registry using a hash of a password associated with the user that allows the user to access the primary cloud provider;

retrieving the key associated with the device from the decrypted client registry;

decrypting a locally stored cloud configuration using the key;

obtaining credentials of the plurality of cloud providers from the decrypted locally stored cloud configuration;

generating a plurality of coded fragments from the data file by applying a generator matrix of erasure encoding to the data file, wherein a cardinality of the plurality of coded fragments corresponds to a cardinality of the plurality of cloud providers associated with the user; and

selecting a respective cloud provider from the plurality of cloud providers for uploading a distinct coded fragment of the plurality of coded fragments.

2. The method of claim 1 , wherein credentials for the primary cloud provider are included in an encrypted data structure of an operating system of the device.

3. The method of claim 1 , further comprising storing a file registry in the primary cloud provider, wherein the file registry includes one or more of: a name and a path of the data file, location and order of a respective coded fragment of the data file, and additional metadata.

4. The method of claim 3 , further comprising initializing a lock for the data file, wherein the lock prevents another device of the user from modifying the file registry.

5. The method of claim 1 , further comprising verifying validity of the password by:

generating a hash of the hash of the password;

retrieving a password key from the primary cloud provider, wherein the password key is a previously generated hash of the hash of the password; and

comparing the generated hash of the hash of the password with the password key.

6. The method of claim 1 , wherein generating the plurality of coded fragments from the data file includes:

obtaining a plurality of data elements from the data file;

converting a respective data element in the plurality of data elements to a numerical representation;

representing the numerical representations as a data matrix; and

multiplying the data matrix with the generator matrix.

7. The method of claim 1 , wherein, in response to detecting a request for a new password, the method further comprises:

decrypting the encrypted client registry using the hash of the password;

obtaining a new password from the user;

encrypting the decrypted client registry using a hash of the new password; and

storing a new password key comprising a hash of the hash of the new password in the primary cloud provider.

8. The method of claim 1 , further comprising maintaining an unencrypted client registry by:

generating a plurality of coded fragments of the unencrypted client registry; and

storing a respective coded fragment of the unencrypted client registry in a corresponding cloud provider.

9. The method of claim 8 , wherein, in response to detecting a request for resetting the password, the method further comprises:

obtaining credentials for a respective cloud provider in the plurality of cloud providers from the user;

obtaining a respective coded fragment of the unencrypted client registry from the corresponding cloud provider using the credentials of that cloud provider;

generating the unencrypted client registry from the obtained coded fragments of the unencrypted client registry; and

in response to a successful generation of the unencrypted client registry, prompting the user for a new password.

10. The method of claim 8 , wherein, in response to detecting a marker indicating that the encrypted client registry has been updated, the method further comprises updating the unencrypted client registry by:

retrieving the encrypted client registry from the primary cloud provider;

decrypting the encrypted client registry using the hash of the password; and

generating a plurality of coded fragments of the decrypted client registry.

11. A device of a user, the device comprising:

a processor; and

a storage device storing instructions that when executed by the processor cause the processor to perform a method, the method comprising:

identifying a data file to be uploaded to a cloud storage of the user;

obtaining an encrypted client registry from a primary cloud provider in a plurality of cloud providers that provide cloud storage to the user, wherein the client registry comprises a key associated with the device;

decrypting the encrypted client registry using a hash of a password associated with the user that allows the user to access the primary cloud provider;

retrieving the key associated with the device from the decrypted client registry;

decrypting a locally stored cloud configuration using the key;

obtaining credentials of the plurality of cloud providers from the decrypted locally stored cloud configuration;

generating a plurality of coded fragments from the data file by applying a generator matrix of erasure encoding to the data file, wherein a cardinality of the plurality of coded fragments corresponds to a cardinality of the plurality of cloud providers associated with the user; and

selecting a respective cloud provider from the plurality of cloud providers for uploading a distinct coded fragment of the plurality of coded fragments.

12. The device of claim 11 , wherein credentials for the primary cloud provider are included in an encrypted data structure of an operating system of the device.

13. The device of claim 11 , wherein the method further comprises storing a file registry in the primary cloud provider, wherein the file registry includes one or more of: a name and a path of the data file, location and order of a respective coded fragment of the data file, and additional metadata.

14. The device of claim 13 , wherein the method further comprises initializing a lock for the data file, wherein the lock prevents another device of the user from modifying the file registry.

15. The device of claim 11 , wherein the method further comprises verifying validity of the password by:

generating a hash of the hash of the password;

retrieving a password key from the primary cloud provider, wherein the password key is a previously generated hash of the hash of the password; and

comparing the generated hash of the hash of the password with the password key.

16. The device of claim 11 , wherein generating the plurality of coded fragments from the data file includes:

obtaining a plurality of data elements from the data file;

converting a respective data element in the plurality of data elements to a numerical representation;

representing the numerical representations as a data matrix; and

multiplying the data matrix with the generator matrix.

17. The device of claim 11 , wherein, in response to detecting a request for a new password, the method further comprises:

decrypting the encrypted client registry using the hash of the password;

obtaining a new password from the user;

encrypting the decrypted client registry using a hash of the new password; and

storing a new password key comprising a hash of the hash of the new password in the primary cloud provider.

18. The device of claim 11 , wherein the method further comprises maintaining an unencrypted client registry by:

generating a plurality of coded fragments of the unencrypted client registry; and

storing a respective coded fragment of the unencrypted client registry in a corresponding cloud provider.

19. The device of claim 18 , wherein, in response to detecting a request for resetting the password, the method further comprises:

obtaining credentials for a respective cloud provider in the plurality of cloud providers from the user;

obtaining a respective coded fragment of the unencrypted client registry from the corresponding cloud provider using the credentials of that cloud provider;

generating the unencrypted client registry from the obtained coded fragments of the unencrypted client registry; and

in response to a successful generation of the unencrypted client registry, prompting the user for a new password.

20. The device of claim 18 , wherein, in response to detecting a marker indicating that the encrypted client registry has been updated, the method further comprises updating the unencrypted client registry by:

retrieving the encrypted client registry from the primary cloud provider;

decrypting the encrypted client registry using the hash of the password; and

generating a plurality of coded fragments of the decrypted client registry.