Every user has some confidential data that third parties should not be able to access. The more you rely on mobile computing and on working in different environments and networks, the more carefully you should handle your data. The encryption of files or entire partitions is recommended if others have network or physical access to your system. Laptops or removable media, such as external hard disks or USB sticks, are prone to being lost or stolen. Thus, it is recommended to encrypt the parts of your file that hold confidential data.
There are several ways to protect your data by means of encryption:
You can create an encrypted partition with YaST during installation or in an already installed system. Refer to Section 47.1.1, Creating an Encrypted Partition during Installation and Section 47.1.2, Creating an Encrypted Partition on a Running System for details. This option can also be used for removable media, such as external hard disks, as described in Section 47.1.4, Encrypting the Content of Removable Media.
You can create an encrypted file on your hard disk or on a removable medium with YaST at any time. The encrypted file can then be used to store other files or folders. For more information, refer to Section 47.1.3, Creating an Encrypted File as a Container.
With SUSE Linux Enterprise, you can also create encrypted home directories for users. When the user logs in to the system, the encrypted home directory is mounted and the contents are made available to the user. Refer to Section 47.2, LOGIN.key for more information.
If you only have a small number of ASCII text files that hold sensitive or confidential data, you can encrypt them individually and protect them with a password using the vi editor. Refer to Section 47.3, Using vi to Encrypt Single ASCII Text Files for more information.
WARNING: Encrypted Media Offers Limited Protection
The methods described in this chapter offer only limited protection. You cannot protect your running system from being compromised. After the encrypted medium is successfully mounted, everybody with appropriate permissions has access to it. However, encrypted media are useful in case of loss or theft of your computer or to prevent unauthorized individuals from reading your confidential data.