A brief look at various codes used through history to send and receive secret messages.

Code-cracking skills can be put to the test in this entertaining book which teaches children how to write and decode secret messages. Includes Semaphore and Mor

Learn new codes and follow a story involving undercover agents and secret code experts.

Break secret codes and decipher vital messages in this mini book of puzzles. From collecting launch codes to reading spy watches, it's packed with activities th

Explains various methods used in cryptography and presents examples to help readers in breaking secret codes