reference:https://help.ubuntu.com/community/EncryptedFilesystemsOnRemovableStorage
sudo cryptsetup --verify-passphrase luksFormat /dev/sdb1 -c aes -s 256 -h sha256
sudo cryptsetup luksOpen /dev/sdb1 mountable_partition
sudo mkfs -t ext4 /dev/mapper/mountable_partition
sudo mount /dev/mapper/mountable_partition /mnt/point