How to password-protect single user mode in RHEL5?

Solution Verified - Updated -

Issue

  • How to password-protect single user mode in RHEL5?
  • How to secure your server and password protect going into single user mode?
  • How to enforce a password for the single user mode?
  • How can we prevent anyone from getting into single-user mode or runlevel 1 without a password?

Environment

  • Red Hat Enterprise Linux 5

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