This repository is intentionally limited to safe, educational use. Use it only on text you own or are explicitly authorized to analyze. It focuses on classical cryptography history and ...

# A Caesar cipher shifts each letter by a fixed number of positions in the alphabet. # Used by Julius Caesar to send secret messages. Shift by 3: A→D, B→E, Z→C. # NEW CONCEPTS: ord() and chr() # Every ...

Introduction If you need to send a secret message to a friend, how could you prevent other people from reading it? One way is to encrypt the message—that is, use a secret code that only you and your ...