The station-to-station (STS) protocol is also based on the Diffie-Hellman key exchange. This is another important chord scheme, but it offers protection from man-in-the-middle attacks as well as the perfect front secret. A method to authenticate the parties that communicate with each other is usually necessary to prevent this type of attack. Variants of Diffie-Hellman, z.B. THE STS protocol, can be used to avoid these types of attacks. As one of the most common methods of distributing keys safely, Diffie Hellman key exchange is often implemented in security protocols such as TLS, IPsec, SSH, PGP and many others. This makes it an integral part of our secure communication. The Diffie-Hellman key exchange was the first widely used method to safely develop and exchange keys via an uncertain channel. The Diffie-Hellman key exchange [nb 1] is a method of secure exchange of cryptographic keys via a public channel and was one of the first public key protocols designed by Ralph Merkle and named after Whitfield Diffie and Martin Hellman.
  DH is one of the first practical examples of public key exchange in the field of cryptography. Published in 1976 by Diffie and Hellman, it was the first work known to the public that proposed the idea of a private key and a corresponding public key. Diffie-Hellman key exchange, also called exponential key exchange, is a digital encryption method that increases numbers to certain forces to get decryption keys based on components that are never directly transferred, so the task of a purported codebreaker is mathematically overwhelming. While Diffie Hellman`s key exchange may seem complex, it is a fundamental part of secure online data exchange. As long as it is implemented with an appropriate authentication method and the numbers have been correctly selected, it is not considered vulnerable to attack. The value of x is identical according to one of the two formulas above. However, personal keys a and b, important for calculating x, were not transmitted through a public media.