ecryptfs-utils and used it to create a
Private encrypted folder in my home directory.
During creation of
Private encrypted folder I was asked for a login passphrase and a mount passphrase. As far as I understood the login passphrase should match my Ubuntu user login password and the mount passphrase should be required to access the encrypted folder.
To my surprise, instead, whenever I want to mount my Private folder running command
ecryptfs-mount-private, I am asked for my login passphrase instead of my mount passphrase. Is it so that
ecryptfs is expected to behave?
I thought that the two passfrases were a double protection in case someone crack my login password, to protect my most private data.
So, what the mount passphrase is useful for and when someone (who) is required to use it?