The Code Book by Simon Singh: A history of cryptography from ancient Egypt through quantum computing. My favorite parts were about WWII, with Turing and the Navajo Codetalkers. Some parts were a touch slow – cryptography isn’t nearly as thrilling as the activities associated with it – but by and large it was an informative read. My only real complaint was how long it took me to read. Though Singh’s text was thorough and readable as ever, it took me nearly a month to finish. I think I just wasn’t in the right mood for a math book.

Also posted on BookCrossing.