This part, yikes:

> As our encryption is asymmetric, you may be asking how the client decrypts messages send by the server if it only has a public key. To do this the game exploits an interesting quirk of RSA cryptography, its possible to encrypt with the private key and decrypt with the public key. This is exactly what happens when the server sends the client message. For anyone contemplating doing this though, don’t, it’s terrible for a number of reasons. You can read some of these reasons here, written by someone far more knowledgeable about cryptography than myself.

Great effort reverse engineering the protocol and producing an enjoyable write up.