From the course: CompTIA CySA+ (CS0-002) Cert Prep: 4 Software and Systems Security

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Diffie-Hellman

Diffie-Hellman

From the course: CompTIA CySA+ (CS0-002) Cert Prep: 4 Software and Systems Security

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Diffie-Hellman

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- [Instructor] The Diffie-Hellman Key Exchange algorithm solves the problem of key exchange for symmetric encryption algorithms. The algorithm was invented in 1976 by three cryptographers. It was based upon the work of Ralph Merkle and turned into a practical algorithm by Whitfield Diffie and Martin Hellman. Unfortunately for Merkel, his name was never included in the popular name used for the algorithm and we're left with the Diffie-Hellman algorithm. I am going to show you how Diffie-Hellman works mathematically. But first, I want to use an analogy to share the purpose of the algorithm using colors instead of numbers, this will make the concept a little easier to understand. Let's say that Alice and Bob want to agree upon a common shared secret color that they don't want other people to know. Here is one way that they might do that. First, Alice sends a message to Bob, telling him a common color that they might use.…

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