cryptsetup的使用

sudo modprobe aes
sudo modprobe dm-crypt

//sdb是我的usb设备，当然也可以自己建个磁盘虚拟设备
sudo cryptsetup luksFormat /dev/sdb 


sudo cryptsetup luksOpen /dev/sdb quan


ls /dev/mapper/quan -l


sudo mkdir /crypt


sudo mkfs.ext4 /dev/mapper/quan 


sudo mount /dev/mapper/quan /crypt/


//do what you want


sudo umount /crypt


sudo cryptsetup luksClose /dev/mapper/quan


sudo mount -a