Introduction to Cryptography - With examples of the Caesar Shift Cipher and ROT13 in Python

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