How can GRUB be password protected to prevent security intrusions?

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GRUB can be configured to prevent access to the GRUB Console and the single user mode by adding a password directive to its configuration file.

To add a password directive, do the following:

Decide on a password.
Open a shell prompt, log in as root, and then type:
```
 /sbin/grub-md5-crypt
 
```

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