Sections 3.8 & 2.5-2.8

• The most interesting part of this reading was story of Sherlock Holmes. It's cool to see how cryptography was used in stories. I also liked learning about block ciphers because I really like linear algebra, it's my favorite subject of mathematics.
• The hardest thing to understand was how to decipher the Playfair and ADFGX ciphers. I didn't really understand how it'd be easy to decipher these like the book said.