Welcome to Cryptography

Learn how to write coded messages, decode them, and even combine ciphers.

Together you'll learn:

  • What cryptography is
  • How to create an encoded message with the Caesar Cipher
  • How to create an encoded message with the Polybius Square
  • How to encrypt messages with multiple ciphers or codes

What you'll need to get started:

  • Pencil
  • Paper
  • Laptop or device with a web browser
  • Internet access

What you'll be teaching

Module #1 - Intro to Cryptography

Whether you’re sending messages to a trusted friend or sharing a top-secret cookie recipe, you can use cryptography to keep your communication safe. This module introduces your learner to the concept of cryptography and explores the Caesar Cipher.

Estimated time: 15 minutes

Module #2 - The Polybius Square

Created by a famous scholar in ancient Greece, the Polybius Square is a cryptography system that uses numbers instead of letters. Your learner will discover how to encode and decipher messages using the Polybius Square.

Estimated time: 15 minutes

Module #3 - Combining Ciphers

Now that you’ve mastered two cryptography systems, why not combine them together? In this module your learner will see how to put the two ciphers together to create even stronger codes.

Estimated time: 15 minutes

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