I'd also recommend his The Code Book - https://simonsingh.net/books/the-code-book/ https://simonsingh.net/books/the-code-book/ Nice easy reading on the history

I'd also recommend his The Code Book - https://simonsingh.net/books/the-code-book/ https://simonsingh.net/books/the-code-book/ Nice easy reading on the history of codes.