Diffie-Hellman Key Exchange is a method designed to negotiating and passing encrypted by #Asymmetric Cryptography or Symmetric Cryptography# cryptographic keys over an insecure network. The keys intended to be shared will not be transmitted in plain text, and instead encrypted by a shared secret key which in turned generated from two known prime numbers that have a special #math relationship to one another.
Both parties will retain their own private keys, with a pair of public keys that is encrypted with their corresponding private keys. The encrypted public keys will be shared to each other over an insecure channel. They will encrypt the public keys (now it’s not their own) again using the private keys, which will resulted in same public keys that only both parties know. When both parties obtain back their public key, they could decrypt it and obtain the opposite private key. 1