Protecting Data with Encrypted Linux Partitions - page 3
The Inevitable Whoopsie
Once you have a nice new empty partition, you'll encrypt it with the
cryptsetup command. Be very sure you are encrypting the correct partition:
# cryptsetup --verbose --verify-passphrase -c aes-cbc-plain luksFormat /dev/sda2 WARNING! ======== This will overwrite data on /dev/sda2 irrevocably. Are you sure? (Type uppercase yes): YES Enter LUKS passphrase: Verify passphrase: Command successful.
This creates the encrypted partition. Now you need to create and name a mountable logical partition. In this example, it is named
sda2, which could be
mysecretpartition, or anything you want:
# cryptsetup luksOpen /dev/sda2 sda2 Enter LUKS passphrase: key slot 0 unlocked. Command successful.
This should show as a block device in
$ ls -l /dev/mapper total 0 crw-rw---- 1 root root 10, 63 2007-06-09 18:38 control brw-rw---- 1 root disk 254, 0 2007-06-09 19:46 sda2
Now put a filesystem on the logical partition:
# mkfs.ext3 /dev/mapper/sda2
Now you need to make a mount point so you can mount and use this nice new encrypted partition. Remember, you must use the device name is from
/dev/mapper/. I'll put it in my home directory. Watch for operations that require rootly powers:
$ mkdir /home/me/crypted # mount /dev/mapper/sda1 /home/me/crypted
Confirm that it mounted, and write a test file:
# df -H [...] Filesystem Size Used Avail Use% Mounted on /dev/mapper/sda2 7.9G 152M 7.3G 3% /home/carla/crypted # cd /home/me/crypted # nano test # ls lost+found test
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