Authorization from files.mycloud.com to your hard drive.

Hello

After logging in to the files.mycloud.com, I can access to WD My Cloud.
What is the authorization from WWW to disk?
Is it an encrypted connection?
What protocol is used?
Is it an FTP connection?

Regards

Edit: never mind. Took reading the post several times to realize the person is apparently asking; what is the security method used between the My Cloud and the MyCloud.com web portal.