SSL
Secure Sockets Layer, created by Netscape, is the predecessor of TLS that was discovered to contain security flaws, making it ineffective in terms of its cryptographic capacity.
SSL starts a session between the server and client by generating session keys to protect the integrity of data being exchanged. Its method is called a “handshake” wherein only a successful handshake can initiate a safe connection. Data is encrypted/decrypted on each end with the session key known by the server and client. Failing a step will prevent a connection to be established.