Khan Academy
Khan Academy: Journey Into Cryptography: Perfect Secrecy
Claude Shannon's idea of perfect secrecy: no amount of computational power can help improve your ability to break the one-time pad.
Khan Academy
Khan Academy: Journey Into Cryptography: What Is Cryptography?
What is Cryptography? A story which takes us from Caesar to Claude Shannon.
Khan Academy
Khan Academy: Origin of Markov Chains
This video serves as an introduction to Markov Chains. [7:15]