If you are a linux user like me, you know the value of being able to password-protect your GRUB entries so even if your whole PC gets stolen, no one should be able to access your valuable, classified data. (or porn?)
When talking of security in computer systems one often needs to analyse the situation one is in and choose the appropriate options. If you have hackers getting physical access to your computer system the GRUB security measures won’t last a second (pretty much nothing would do). Your best bet in such a situation is to keep the hard dr