Password-protecting the bootloader is one method you may employ to enhance the physical security profile of your computer. GRUB, the GRand Unified Bootloader, is the default bootloader on virtually all Linux distributions, but on a significant number, the installer does not have support for setting a GRUB password.
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How to enhance the physical security posture of your Linux/BSD-powered PC
http://linuxbsdos.com –
Securing a computer goes beyond more than just using strong passwords. You should consider what happens if an unauthorized person gains physical access to your computer. If the only security feature protecting your data from an unauthorized person is a user account password, then you have not taken enough steps to protect your computer and your data.
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http://blog.dipinkrishna.info –
For this you required to generate your own personal set of private/public pair. ssh-keygen is used to generate that key pair for you.
On the user’s home directory, on the localhost, type
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Protect your grub by applying a password to it (grub-md5-crypt is broken)
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You have two ways to do that. Maybe you want the user to enter a password in order to boot the Recovery Mode or your secondary OS. You have to set that password in the /boot/grub/menu.lst - for higher security you should crypt your password with md5.
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Howto Password Protect Grub in Ubuntu / Debian Linux
http://shibuvarkala.blogspot.com –
Some recent posts showing that your linux box is not secure unless you installed a grub Password.
If you are an administrator of a highly sensitive server, you must do it.
To add a password for grub, first you must generate an md5 password hash using the grub-md5-crypt utility: grub-md5-crypt
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