So, you have a conspiracy going and need to pass messages along without worrying that someone will intercept them. Congratulations, you've stumbled across the right book. Whether your personal solution is a Vigenere, a Vic, or a One Time Pad, you'll find an easy guide on creating your own encryption scheme right here. No need for a computer, except for the device you're reading this on. This can all be done in your favorite notebook, with a PENCIL!