How many have heard of the RHV? This was a way to send and receive encrypted traffic when the Enigma was broken or not available. This procedure was manual but did use an available K-Book if possible. Go to Dirks website and look it up, its pretty interesting. Below, is a message I coded up using the RHV. Without having the code tables (actually a bunch of bigram tables, you'd be hard pressed to decipher. But this is an actual message I put together to give an idea what an RHV message looks like.