I've seen speculation that his method may have been as simple as the ancient Spartan Scytale (https://en.wikipedia.org/wiki/Scytale https://en.wikipedia.org/wik

I've seen speculation that his method may have been as simple as the ancient Spartan Scytale (https://en.wikipedia.org/wiki/Scytale https://en.wikipedia.org/wiki/Scytale).