Power of Patterns Cryptography. Cryptography has shaped the history of the world, from kings and queens to the average person today. It is a mighty tool that can be used for good and for bad. The techniques to encode messages have evolved over time, but the goal remains the same to protect top-secret information from interception. Learn all about the history of cryptography and its modern uses with this high-interest book Developed by Timothy Rasinski-a leading expert in reading research-this 6-Pack of nonfiction readers guides students to increased fluency and comprehension of nonfiction text. The complex text structure adds rigor