Sharing Secrets Using Mathematics | The Diffie-Hellman Key Exchange

The Diffie-Hellman Key exchange is a hallmark of cryptography and answers a question I personally though would not have an answer. Come along and figure out how to share secrets with a friend despite always being listened to.
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0:00 Introducing the problem
0:51 Caesar Cipher
2:18 A Useful Function
3:59 Fast Modular Exponentiation
7:48 The Discrete Log
9:51 The Diffie Hellman Key Exchange

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Thank you!