Protecting Your Root Password

"This will not protect your system against boot from a LiveCD: To do this, edit the BIOS to remove the CD/DVD drive from the boot options, then password-protect it.

"Remember that if you forget this password, you won't be able to re-edit the BIOS if you do need to boot from a CD! Finally, bear in mind that a serious attacker will not be thwarted by these measures. If you need more protection, look at your site's overall physical security, and consider encrypting your hard drives."

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