The Diffie-Hellman Key Exchange Protocol

Cryptographic Explanation

The simplest and the original implementation, later formalized as Finite Field Diffie-Hellman in RFC 7919, of the protocol uses the multiplicative group of integers modulo p, where p is prime, and g is a primitive root modulo p. These two values are chosen in this way to ensure that the resulting shared secret can take on any value from 1 to p–1. Here is an example of the protocol, with non-secret values in blue, and secret values in red.

Explotation