Do not bend, staple, or fold.
Now that we have a grasp on how encryption works (from a high-level black box perspective, at least), we concern ourselves with how to generate cryptographically strong keys. I highly recommend reading Part 1 and Part 2 first.
My Raspberry Pi arrived in the mail earlier this week. However, work, family, and other commitments meant that tinkering with it had to wait until the weekend. Until today, all that I managed to accomplish was to download a Debian-based OS image, flash it to an SD card, hook the board up to my TV, and squeal with joy as it booted.