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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: Polyalphabetic Cipher
Find out how does a codebreaker works?
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: Journey Into Cryptography: The Caesar Cipher
Lear about the Caesar Cipher with this video.