Skip to content# Codes, Ciphers, and Secrets

**Classifications**

Author(s): Anne Ho

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).

Session styles: Problem Posing, Try a Smaller Problem

Mathematical practices: MP1 – Make sense of problems and persevere in solving them., MP5 – Use appropriate tools strategically.

Supporting materials: Facilitator Guides, Handouts

Associated Math Circles: MTC Network