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openSUSE 11.1 Reference Guide
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36.1 Setting Up an Encrypted File System with YaST

Use YaST to encrypt partitions or parts of your file system during installation or in an already installed system. However, encrypting a partition in an already installed system is more difficult, because you have to resize and change existing partitions. In such cases, it may be more convenient to create an encrypted file of a defined size in which to store other files or parts of your file system. To encrypt an entire partition, dedicate a partition for encryption in the partition layout. The standard partitioning proposal as suggested by YaST, does not include an encrypted partition, by default. Add it manually in the partitioning dialog.

36.1.1 Creating an Encrypted Partition during Installation

WARNING: Password Input

Make sure to memorize the password for your encrypted partitions well. Without that password you cannot access or restore the encrypted data.

The YaST expert dialog for partitioning offers the options needed for creating an encrypted partition. To create a new encrypted partition proceed as follows:

  1. Run the YaST Partitioner from the YaST Control Center with System > Partitioner

  2. Click Create and select a primary or a logical partition.

  3. Select the desired file system, size and mount point of this partition.

  4. If the encrypted file system should only be mounted when necessary, enable Do Not Mount at System Start-up in the Fstab Options.

  5. Activate the Encrypt file system check box.

  6. Click OK. You will be prompted for a password that is used to encrypt this partition. This password is not displayed. To prevent typing errors, enter the password twice.

  7. Complete the process by clicking OK. The new encrypted partition is now created.

The operating system requests the password while booting before mounting the partition. The partition is available to all users once it has been mounted.

To skip mounting the encrypted partition during start-up, click Enter when prompted for the password. Then decline the offer to enter the password again. In this case, the encrypted file system is not mounted and the operating system continues booting, blocking access to your data.

When you are installing your system on a machine where several partitions already exist, you can also decide to encrypt an existing partition during installation. In this case follow the description in Section 36.1.2, Creating an Encrypted Partition on a Running System and be aware that this action destroys all data on the existing partition to encrypt.

36.1.2 Creating an Encrypted Partition on a Running System

WARNING: Activating Encryption on a Running System

It is also possible to create encrypted partitions on a running system. However, encrypting an existing partition destroys all data on it and requires resizing and restructuring of existing partitions.

On a running system, select System > Partitioning in the YaST Control Center. Click Yes to proceed. In the Expert Partitioner, select the partition to encrypt and click Edit. The rest of the procedure is the same as described in Section 36.1.1, Creating an Encrypted Partition during Installation.

36.1.3 Creating an Encrypted File as a Container

Instead of using a partition, it is possible to create an encrypted file of a certain size that can then hold other files or folders containing confidential data. Such container files are created from the YaST Expert Partitioner dialog. Select Crypt Files and enter the full path to the file and its size. Accept or change the proposed formatting settings and the file system type. Specify the mount point and decide whether the encrypted file system should be mounted at system boot. Make sure that the checkbox Encrypt File System is activated.

The advantage of encrypted container files over encrypted partitions is that they can be added without repartitioning the hard disk. They are mounted with the help of a loop device and behave just like normal partitions.

36.1.4 Encrypting the Content of Removable Media

YaST treats removable media like external hard disks or USB flash drives the same as any other hard disk. Container files or partitions on such media can be encrypted as described above. However, enable Do Not Mount During Booting in the Fstab Options dialog, because removable media are usually only connected while the system is running.

If you have encrypted your removable device with YaST, the KDE and GNOME desktops automatically recognize the encrypted partition and prompt for the password when the device is detected. If you plug in a FAT formatted removable device while running KDE or GNOME, the desktop user entering the password automatically becomes the owner of the device and can read and write files. For devices with a file system other than FAT, change the ownership explicitly for users other than root to enable these users to read or write files on the device.

openSUSE 11.1 Reference Guide
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