cryptography

Presents a variety of codes and ciphers and includes messages to encode and decode, as part of a story.

This account of the Allied efforts to decode Axis messages--and keep the success of their efforts secret--describes the men and women behind the scenes, as well as the institutions they served, and the early computers devised for the purpose.

Discusses secret writing, ciphers, and the processes of creating and deciphering secret or difficult languages. Includes thinking and writing exercises.

Two Navajo brothers use their native language that they've been forbidden to speak to help in winning World War II.

Presents various methods of writing, speaking, and signaling secret messages.

Discusses the history and different varieties of codes and ciphers, describing code machines, signals, sign language, picture languages, and hidden messages.

This book discusses the battle between codemakers and codebreakers that has been going on for centuries as well as describing the processes of enciphering and deciphering.