What is LUKS disk encryption and how can it be implemented?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5

Issue

  • What is LUKS? cryptsetup? dm-crypt?
  • What is the difference between cryptsetup plain and cryptsetup LUKS?
  • What packages are required for LUKS in Red Hat Enterprise Linux?
  • How can LUKS HDD-encryption be accomplished in Red Hat Enterprise Linux?
  • What cipher does LUKS use to encrypt a disk?
  • How big are the encryption keys LUKS uses? Can this be changed?
  • Why do devices encrypted with cryptsetup use a different mode than devices encrypted at install-time?

Resolution

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