Diffie Hellman key exchange is a way to exchange cryptographic keys securely over a public channel and it is considered one of the first public key protocols. This method creates a shared secret between two computers, so it will be used for communication and exchanging data over a public network. It has a lot of uses such as encryption, forward secrecy protocols, password authentication key agreement, and in a public key infrastructure. One use of the Diffie Hellman method in encryption is the Integrated Encryption Scheme (IES) which is based on it. Next protocols that create forward secrecy must create and generate new keys for each new session and discard when the session is over, they use the DH key method because of how fast it generates
