Instructional Video
Khan Academy

Khan Academy: Journey Into Cryptography: Perfect Secrecy

6th - 9th
Claude Shannon's idea of perfect secrecy: no amount of computational power can help improve your ability to break the one-time pad.
Instructional Video
Khan Academy

Khan Academy: Journey Into Cryptography: What Is Cryptography?

9th - 10th
What is Cryptography? A story which takes us from Caesar to Claude Shannon.
Instructional Video
Khan Academy

Khan Academy: Origin of Markov Chains

9th - 10th
This video serves as an introduction to Markov Chains. [7:15]