The main reason to password protect the GRUB boot loder is to Prevent Access to Single User Mode — If attackers can boot the system into single user mode, they are logged in automatically as root without being prompted for the root password.
To do this, open a shell prompt, log in as root, and type:
/sbin/grub-md5-crypt
When prompted, type the GRUB password and press Enter. This returns an MD5 hash of the password.
Next, edit the GRUB configuration file /boot/grub/grub.conf. Open the file and below the timeout line in the main section of the document, add the following line:
password --md5
Replace with the value returned by /sbin/grub-md5-cryp
Kishore
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