How to Load Luks Passphrase from Usb, Falling Back to Keyboard

cryptsetup offline attack with list of known keys possible?

If you can remove the disks and add them to another system, you can LUKS mount the disks without rebooting, and thereby get as many tries as you want.

Mount and unlock encrypted Tryecrypt drive

If you've encrypted this partition as a system drive, you'll need to mount it with system encryption without pre-boot authentication. This is available in the GUI using Volumes -> Mount Volumes with Options on Windows (but it might not be available with the Linux GUI).

If you want to do with on the command line, you'll have to find the equivalent on the /m sm option on Windows (note that this page is for the Windows CLI, the Linux version varies slightly, use truecrypt --help). Although there doesn't seem to be details about the possible values for -m, the following should work:

truecrypt -m system /dev/sda1

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