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I want to give high security for my linux box. So i planed to use my pen drive as key for my linux box.

How can i do it ?

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    What is your backup plan in case you loose your pen-drive? – lamcro Sep 21 '10 at 16:16
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Additionally you can authenticate by usb device (including one time pads and any mix with other PAM modules of course). As tante said you can also store keys to harddrive on usb device.

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If you mean to use a pendrive to decrypt and encrypt your harddrive, yes that is possible and actually not that complex. You can find full documentation at this Gentoo Wiki article (applies to other distributions as well)

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Alternatively, check out the Yubikey concept, from Yubico. Pretty nice.

I used to use pam_usb, like Maciej suggests, but the project's last release is three years old.

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You can put your whole Linux system on a 64G or 128G pendrive and boot from it. Your Linux box will be as secure as your pocket.

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    Do let me stress "secure as your pocket". Although not used for securing a whole box, I was using a thumb-drive on my (real) key chain as containing part of a key I needed to access a non-critical crypto (virtual) key-ring. I removed the thumb drive in order to take off a key, and poof, I need a new strategy (or at least redundancy). – msw Sep 20 '10 at 16:53

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