1. The book mentions the concepts of confusion and diffusion and relates them to some of the systems we've learned about. However, the classical cryptosystems were not mentioned. My question is do all block ciphers have the properties of confusion and diffusion? Do the Playfair and ADFGX ciphers have those properties?
2. I am really enjoying how the book logically builds up to more complex cryptosystems. It's very easy to follow. I specifically appreciated the review of inverting a matrix and learning about the Playfair cipher, which I had heard referenced in movies, but I didn't really know what it was. I also enjoyed the Sherlock Holmes reference, which helped me realize how widespread and well-used encryption methods really are.
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