Throughout history codes have been used to pass secure information. In these activities students will learn about past and present methods of cryptography while working hands-on to code and decode vital information.
Objective: Students will learn about modular (clock) arithmetic and how modular arithmetic can be used to encode messages using simple shift, multiple, and affine ciphers.
Materials: Each student will need
Introduce the topic to students. Consider these exploration questions:
The following sections will guide students through activities exploring cryptography.