Decrypt AES Cookie outside of the load balancer

We're working on getting this documentation up, but it's quite a big task. We also hope to have code to encrypt and decrypt, but I can't 100% promise that. At any rate, it will be several weeks at the least before this is released. I know I've said that "we're working on it" before, but a lot progress has been made: the technical bits have been written up, and we're just working on getting them all digested into a single, approachable document.