encryption:luks-container

Table of Contents

LUKS Encrypted Container

LUKS Encrypted Container

With cryptsetup 2.1.0, the LUKS header takes up just under 16MiB, so the partition size must be 16MiB + the size of the data you want to store in it.

Create a LUKS Storage Container

Create a 20Mb file filled with random data: ¹⁾

sudo dd if=/dev/urandom of=encrypted.luks.img iflag=fullblock bs=1M count=20

Switch to root:
```
sudo -s
```
Set permissions:
```
chmod go= encrypted.luks.img
```

Configure encryption:

cryptsetup --verbose luksFormat encrypted.luks.img
cryptsetup --verbose --use-random luksFormat encrypted.luks.img

Open the encrypted container:

cryptsetup --verbose luksOpen encrypted.luks.img encrypted

Create filesystem:
```
mkfs.ext4 /dev/mapper/encrypted
```
Create directory to mount the container:
```
mkdir /mnt/encrypted
```

Mount the container:

mount -t ext4 -o journal_checksum /dev/mapper/encrypted /mnt/encrypted

Chown it:
```
chown chuck: /mnt/encrypted
```
Set permissions:
```
chmod go= /mnt/encrypted
```
Switch back to $USER:
```
exit
```

Copy Files to the LUKS Storage Container

Copy or create your files:
```
cp /files/to/copy /mnt/encrypted
```

Close the LUKS Storage Container and Lock it

Switch to root:
```
sudo -s
```
Unmount the container:
```
umount /mnt/encrypted
```
Close the encrypted container:
```
cryptsetup luksClose encrypted
```
Switch back to $USER:
```
exit
```

Change Password on a LUKS Encrypted Storage Container

If you want/need to change the password:

sudo cryptsetup luksChangeKey encrypted.luks.img

¹⁾

https://pthree.org/2012/02/20/randomize-first-the-encrypt-your-block-device/

encryption/luks-container.txt · Last modified: 2021/11/09 19:12 by chuck