Author Description

Need to Know? Codes and Ciphers discusses everything from smoke signals to the encryption devices used by government agencies and the military. As well as covering the history of the development of codes and ciphers, this book also has practical information and advice on how to make codes (whether by pencil and paper, or by computer) and, more importantly, how to break them!Includes:- The role of codes and ciphers throughout history- The development of code-breaking devices- Native American smoke signals, Masonic signals, flags, and semaphore- Morse code, Braille, and ASCII computer language- Mono and polyalphabetic letter substitution- Computer algorithms