: The original edition included a "Cipher Challenge" with a £10,000 prize, which famously took a team of cryptographers a year to solve. Where to Find It Legally to find a physical or ebook copy at a library near you.
If you are looking for a deep dive into the world of ciphers, here is what makes this book a classic: Historical Narrative the code book by simon singh pdf
The Code Book by Simon Singh is widely regarded as one of the best introductory books on the history of cryptography and secret communication. While you can find various previews and excerpts of The Code Book : The original edition included a "Cipher Challenge"