Cryptography Basics: Learn Caesar Shift & ROT13 with Python Examples 🔐

Cryptography is used to protect information, to guarantee it's not been tampered with and a way to prove the original source of the information.

In the first video on Cryptography I discuss some historical moments in cryptography, explain about the terminology, show how the Caesar Shift Cipher works, how ROT13 can be used to obfuscate punchlines on forums and how to create your own ROT13 encryption in Python.

The example code shows how you can create ROT13 encryption algorithm in Python. It's not actually needed as the Python library 'codecs' already includes an implementation of the library, but this demonstrates how it could be achieved.

For more details see:
http://www.penguinfortress.com/security/cryptography

Chapters:
00:00 Introduction to cryptography
00:54 History of cryptography
03:13 Terminology Alice, Bob and Eve
05:19 Caesar Shift Cipher
07:54 ROT13
10:09 Code ROT13 in Python
13:40 Summary