Challenge Handshake Authentication-Protokoll(A challenge-response authentication protocol for Point-to-Point Protocol (PPP) connections described in RFC 1994. It uses the industry-standard MD5 hashing algorithm to hash the combination of a challenge string issued by the authenticating server and the user's password in the response)
Dreiwegehandshake(The method for initializing a Transmission Control Protocol (TCP) session between two hosts on an Internet Protocol (IP) network. The three-way handshake synchronizes the sequence number and acknowledgment numbers of the two hosts establishing a connection, exchanges TCP window sizes, and exchanges other TCP options, such as the maximum segment size)