Unlocking LUKS with a USB drive

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Hello. I am using Fedora 19 and would like to be able to unlock the LUKS root partition on my hard drive using a two factor authentication of both a passphrase and a sector stored on a USB flash drive. Accomplishing this requires modifying the boot process to read a USB device.

This post <http://forums.fedoraforum.org/showthread.php?t=241942>; also available on <http://www.gaztronics.net/howtos/luks.php>; gives information on accomplishing the unlock step using a USB key, but it does not work for Fedora 19. I also found a bug filed which appears to be related <https://bugzilla.redhat.com/show_bug.cgi?id=459485>.

The problem I am having is that the boot process's unlocking of the LUKS container is no longer carried out by /usr/lib/dracut/modules.d/90crypt/cryptroot-ask.sh as it was in past versions of Fedora. I deleted the entire contents of that file and Fedora was still able to boot properly and asked me the password to the LUKS partition. My question then is, what scripts carry out the LUKS unlock step in the boot process of Fedora 19? And can they be modified directly like cryptroot-ask.sh was?

Thank you,
Odie5533
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