How do I check if a partition is encrypted? In particular I would like to know how I check if
/home and swap is encrypted.
Regarding the standard home encryption provided by Ubuntu, you can
sudo ls -lA /home/username/
and if you get something like
totale 0 lrwxrwxrwx 1 username username 56 2011-05-08 18:12 Access-Your-Private-Data.desktop -> /usr/share/ecryptfs-utils/ecryptfs-mount-private.desktop lrwxrwxrwx 1 username username 38 2011-05-08 18:12 .ecryptfs -> /home/.ecryptfs/username/.ecryptfs lrwxrwxrwx 1 username username 37 2011-05-08 18:12 .Private -> /home/.ecryptfs/username/.Private lrwxrwxrwx 1 username username 52 2011-05-08 18:12 README.txt -> /usr/share/ecryptfs-utils/ecryptfs-mount-private.txt
then the username's home directory is encrypted. This works when username is not logged in, so the partition is not mounted. Otherwise you can look at
About the swap, do
sudo blkid | grep swap
and should check for an output similar to
/dev/mapper/cryptswap1: UUID="95f3d64d-6c46-411f-92f7-867e92991fd0" TYPE="swap"
In addition to the answer provided by enzotib, there's the possibility of full disk encryption as provided by the alternate installer. (Also called LUKS-crypt.)
You can use
sudo dmsetup status to check if there are any LUKS-encrypted partitions. The output should look something like:
ubuntu-home: 0 195305472 linear ubuntu-swap_1: 0 8364032 linear sda5_crypt: 0 624637944 crypt ubuntu-root: 0 48824320 linear
The line marked "crypt" shows that sda5 has been encrypted. You can see which filesystems are on that via the lvm tools.
In the case of LUKS encryption, the Disk Utility in Ubuntu will also show the encryption layer and the configuration in a graphical manner.
To check the encrypted swap status and cipher details, use this cmd:
$ sudo cryptsetup status /dev/mapper/cryptswap1 /dev/mapper/cryptswap1 is active and is in use. type: PLAIN cipher: aes-cbc-essiv:sha256 keysize: 256 bits device: /dev/sda2 offset: 0 sectors size: 8388608 sectors mode: read/write
Your swap device name may be different, you can check the proper name by:
$ swapon -s Filename Type Size Used Priority /dev/mapper/cryptswap1 partition 4194300 0 -1