Password protected GRUB Legacy

Add password into the main GRUB section to password protect the interactive operations (i.e. editing menu entries and entering the command-line interface). Optionally add lock into a menu entry to prevent it from executing if no valid password is provided by the user.
$ grub-md5-crypt 
Retype password: 

$ chmod 600 /boot/grub/menu.lst
$ vim /boot/grub/menu.lst
default 0
password --md5sum $1$K0Kh10$OmQNQOthH8jppDFQ5TYx5/

title Linux
kernel ...

title OpenBSD
kernel ...

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