How do I secure GRUB with a plain-text or MD5 hashed password?

Solution Verified - Updated -

Issue

  • How do I secure GRUB with a plain-text or MD5 hashed password?
  • How do I set or reset a GRUB password?
  • How do I lock down GRUB to prevent people modifying the kernel boot parameters?

Environment

  • Red Hat Enterprise Linux 4, 5, 6

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