Hill ciphers

Cryptography is the science of making and breaking codes. It is the practice and study of techniques for secure communication. Modern cryptography intersects the disciplines of mathematics, computer science, and electrical engineering. Applications of cryptography include ATM cards, computer passwords, and e-commerce. In this article we explore an interesting cryptography method known as the Hill Cipher, based on matrices. We explore the method using the spreadsheet MS Excel to perform operations on matrices