ykfde - yubikey-based full disk encryption

Quick start:

install the package uuidgen > /boot/yubikey-challenge ykchalresp $(cat /boot/yubikey-challenge) cryptsetup luksAddKey /dev/sda2 /boot/yubikey-challenge

On bootup, you will be asked to insert a yubikey (2.2 or newer) which will then provide the response. If you do not want to use a yubikey, press enter and then enter a normal passphrase during bootup.

Limitations/bugs:

• uses the default ykchalresp settings, meaning no support for slot 2
• does not update the challenge after each boot.