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# The Mathematics of Diffie-Hellman Key Exchange
- URL: https://www.cascadepbs.org/show/infinite-series/episode/the-mathematics-of-diffie-hellman-key-exchange-kjh6sr/
- Published: 2024-04-02T22:52:11.000Z
- Updated: 2025-08-21T06:35:33.000Z
- Description: How can two people share the same key without someone else getting a hold of it?
- Author: Cascade PBS Staff
- Tags: Infinite Series, Season 2, Episode 6, #ZZZ_Episode_a29b0a41-4631-4180-82c0-970491b4a9c7, #episode, #ZZZ_Show_0efdefa6-fb6f-44e5-96f1-baf9a8c090e2, #geo-us, #v1.16

Symmetric keys are essential to encrypting messages. How can two people share the same key without someone else getting a hold of it? Upfront asymmetric encryption is one way, but another is Diffie-Hellman key exchange.