Math for Liberal Studies - Lecture 3.7.2 The Vigenère and Autokey Ciphers

This is the second video for Math for Liberal Studies Section 3.7: Modular Arithmetic and Ciphers. In this video, we apply the modular arithmetic ideas from the previous lecture to cryptography. Specifically, we learn how to replace the letters in a message with numbers and perform "letter arithmetic." We then apply those ideas to two new encryption methods.