ecryptfs crypt/mount directory
# ~/.ecryptfsrc
# key=passphrase:passphrase_passwd_file=/paht.txt # passphrase_passwd=some_passphrase
# ecryptfs_sig= # cat ~/.ecryptfs/sig-cache.txt
ecryptfs_cipher=aes
ecryptfs_key_bytes=16
ecryptfs_passthrough=n
ecryptfs_enable_filename_crypto=n
# create/mount
sudo mount -t ecryptfs DIR_PATH DIR_PATH