Prepare an exhibit on cryptography. Include devices or charts for writing and deciphering codes, coded messages, and illustrations of famous codes from history. For example, codes are found in literature in Before the Curtain Falls, by J. Rives Childs; The Gold Bug, by Edgar Allan Poe, Voyage to the Center of Earth, by Jules Verne.
Richard Andree, “Cryptography as a Branch of Mathematics,” The Mathematics Teacher, November 1952.
Martin Gardner, “Mathematical Games Department,” Scientific American, August 1972, pp. 114-118.
Dennis Shasta, Codes, Puzzles, and Conspiracy, Menlo Park, CA: Dale Seymour Publications, 1993.