Initialization
dd if=/dev/zero of=fs.bin bs=1M count=5
losetup /dev/loop1 fs.bin
cryptsetup luksFormat /dev/loop1
Open and mount
cryptsetup luksOpen /dev/loop1 fs.bin
mkfs.ext3 /dev/mapper/fs.bin
mkdir crypted
mount /dev/mapper/fs.bin crypted
Umount and close
umount crypted
cryptsetup luksClose fs.bin
losetup -d /dev/loop1