Ho, Anne. (2008). Codes, Ciphers, and Secrets. In S. Kohli (Ed.), Math Circle Activity Database. American Institute of Mathematics.

Codes, Ciphers, and Secrets

Math Circles:
Cryptography is the study and practice of secure communication, making it an interesting and relevant application. In addition to number theory concepts like modular arithmetic, this session uses locks, codes, and ciphers to explore functions (definition, inverse functions, linear functions).

Activity Guide

This guide looks at cryptography examples and goes into the underlying math of the activity.