Secret Key Exchange (Diffie-Hellman) – Computerphile

How do we exchange a secret key in the clear? Spoiler: We don’t – Dr Mike Pound shows us exactly what happens.

Mathematics bit:
Computing Limit:

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

Computerphile is a sister project to Brady Haran’s Numberphile. More at

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