Difference between revisions of "Dm-crypt"

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{{Related|Disk Encryption}}

Revision as of 06:54, 24 November 2013

Tango-document-new.pngThis article is a stub.Tango-document-new.png

Notes: This article is currently under heavy restructuring: for its latest stable revision see Dm-crypt with LUKS (Discuss in Talk:Dm-crypt#)

Merge-arrows-2.pngThis article or section is a candidate for merging with Plain dm-crypt without LUKS.Merge-arrows-2.png

Notes: Merge in dm-crypt with LUKS/Encrypting an entire system, but then this page will have to be moved to dm-crypt (and all the subpages will have to follow); the introduction will have to be rewritten too. (Discuss in Talk:Plain dm-crypt without LUKS#Merge)

This article focuses on how to set up full system encryption on Arch Linux, using dm-crypt with LUKS.

dm-crypt is the standard device-mapper encryption functionality provided by the Linux kernel. It can be used directly by those who like to have full control over all aspects of partition and key management.

LUKS is an additional convenience layer which stores all of the needed setup information for dm-crypt on the disk itself and abstracts partition and key management in an attempt to improve ease of use.

For more details on how dm-crypt+LUKS compares to other disk encryption solution, see Disk Encryption#Comparison table.

Overview

Warning: Encrypting a disk or partition will erase everything currently on that disk or partition, make appropriate data backups prior to starting.

Also be aware that encrypting a system might not only make the life of laptop thieves more miserable, but also yours if you don't plan ahead on:

  • how to make secure backups of the encrypted system/-setup/data and
  • how to access the encrypted system manually for maintenance.
Keeping those points in mind while deciding on how to use encryption may help to decide on method and tools as well.

The installation of a LUKS-encrypted system is largely the same as installing an unencrypted system. Routine creation of an encrypted system follows these general steps:

Note that the Arch installation media comes with all the tools required for system encryption.

Common scenarios

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: This section is an alternative to #Examples, see Talk:Dm-crypt_with_LUKS/draft#New_idea. Add some introductory text with links to the most important subsections of Dm-crypt with LUKS/Encrypting a non-root file system and Dm-crypt with LUKS/Encrypting an entire system. (Discuss in Talk:Dm-crypt#)

See Dm-crypt with LUKS/Encrypting a non-root file system and Dm-crypt with LUKS/Encrypting an entire system.

Drive preparation

This step will deal with operations like securely erasing the drive and partitioning it. See Dm-crypt with LUKS/Drive Preparation.

Device encryption

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: Add some introductory text with links to the most important subsections of Dm-crypt with LUKS/Device Encryption. (Discuss in Talk:Dm-crypt#)

See Dm-crypt with LUKS/Device Encryption.

System configuration

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: Add some introductory text with links to the most important subsections of Dm-crypt with LUKS/System Configuration. (Discuss in Talk:Dm-crypt#)

See Dm-crypt with LUKS/System Configuration.

Examples

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: This section is an alternative to #Common scenarios, see Talk:Dm-crypt_with_LUKS/draft#New_idea. Add some introductory text with links to the most important subsections of Dm-crypt with LUKS/Examples. (Discuss in Talk:Dm-crypt#)

See Dm-crypt with LUKS/Examples.

Swap device encryption

A swap partition may be added to an encrypted system, if required. The swap partition must be encrypted as well to protect any data swapped out by the system. This part details methods without and with suspend-to-disk support.

See Dm-crypt with LUKS/Swap Encryption.

Specialties

This part deals with special operations like securing the unencrypted boot partition, using GPG or OpenSSL encrypted keyfiles, a method to boot and unlock via the network, or setting up discard/TRIM for a SSD.

See Dm-crypt with LUKS/Specialties.

See also

  • cryptsetup FAQ - The main and foremost help resource, directly from the developers.
  • FreeOTFE - Supports unlocking LUKS encrypted volumes in Microsoft Windows.