📂Briefing

Foundations of Cryptography

How do computers communicate?

Other than "programming" languages, how do computers talk in secret code?

Across the internet, there are different ways that information is represented to make the whole world ultimately interconnected.

Activity: Let's try sending each other morse code messages!

Morse Code Translator | Boxentriqboxentriq

🗝️Case 1: Starting from the Basics

What's an encoding scheme for letters?

How can I encode a message of letters?

One of the more well-known encoding schemes, the Caesar Cipher encodes English letters by shifting each letter forward by a certain number of steps.

Crack the CodeGames

Caesar cipher: Encode and decode onlinecryptii

🥗Case 2: Caesar Cipher (Not the Salad)

Are these ciphers actually used?

Has anyone actually used these ciphers for real-world purposes?

Yes! A cool example is the Book Cipher, where a real book is used to hide messages. It has a history dating back to the American Revolution.

https://derekbruff.org/blogs/fywscrypto/historical-crypto/whats-in-a-book-a-brief-history-of-book-ciphers/derekbruff.org

📚Case 3: Reading About the Book Cipher