给U盘加密

试过给磁盘加密后，今晚试了下给U盘加密，步骤如下：

1. 创建cryptsetup_LUKS类型分区.

cadenwu@cadenwu-laptop:~$ sudo fdisk -l

Disk /dev/sdc: 8024 MB, 8024752128 bytes
247 heads, 62 sectors/track, 1023 cylinders
Units = cylinders of 15314 * 512 = 7840768 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xad7cc6ed

   Device Boot Start End Blocks Id System
/dev/sdc1 1 1023 7833080 7 HPFS/NTFS


以上的是我8G的金士顿U盘，/dev/sdc1只有一个分区，文件系统为NTFS。

cadenwu@cadenwu-laptop:~$ lsmod |grep crypt
cryptd 8116 0
dm_crypt 13043 1 

检查是否将必需的模块加载进来，如果没有先加载。

sudo modprobe cryptoloop
sudo modprobe dm_crypt

创建加密分区类型

cadenwu@cadenwu-laptop:~$ sudo cryptsetup luksFormat /dev/sdc1


========
This will overwrite data on /dev/sdc1 irrevocably.

Are you sure? (Type uppercase yes): YES
Enter LUKS passphrase:
Verify passphrase:


2. 创建文件系统

cadenwu@cadenwu-laptop:~$ sudo mkfs.ext4 /dev/sdc1

3. 打开加密分区和关闭加密分区

打开加密分区

cadenwu@cadenwu-laptop:~$ sudo mkdir /mnt/usb
cadenwu@cadenwu-laptop:~$ sudo mount /dev/mapper/lusk /mnt/usb/
cadenwu@cadenwu-laptop:~$ sudo chown cadenwu:cadenwu /mnt/usb/

关闭加密分区

cadenwu@cadenwu-laptop:~$ sudo umount /mnt/usb/
cadenwu@cadenwu-laptop:~$ sudo cryptsetup luksClose /dev/mapper/lusk


(注意：目前在Windows下是认不出这个加密分区的，不要将U盘给全格了 :) )