Hit the following command
The system will ask you for the password, set the password and you will receive the encrypted password save that encrypted password for your security.
#cp /etc/grub.conf /backup -> make backup for your grub.conf
Find “Title Red Hat Enterprise Linux” and go to one line down, then type
Password – -md5
Note*:- Now the system should ask your password
To remove crypt password
Remove password line from the file.