UBTU-20-010414 - Ubuntu operating systems handling data requiring 'data at rest' protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest - data at rest protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.
Information at rest refers to the state of information when it is located on a secondary storage device (e.g., disk drive and tape drive, when used for backups) within an operating system. This requirement addresses protection of user-generated data, as well as operating system-specific configuration data. Organizations may choose to employ different mechanisms to achieve confidentiality and integrity protections, as appropriate, in accordance with the security category and/or classification of the information. NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.
To encrypt an entire partition, dedicate a partition for encryption in the partition layout. Note: Encrypting a partition in an already-installed system is more difficult because it will need to be resized and existing partitions changed.