HP Open Source Security for OpenVMS Volume 2: HP SSL for OpenVMS > Chapter 2 Overview of SSL
The SSL Protocol
This section provides an overview of SSL technology and its application.
The SSL protocol works cooperatively on top of several other protocols. SSL works at the application level. The underlying mechanism is TCP/IP (Transmission Control Protocol/Internet Protocol), which governs the transport and routing of data over the Internet. Application protocols, such as HTTP (HyperText Transport Protocol), LDAP (Lightweight Directory Access Protocol), and IMAP (Internet Messaging Access Protocol), run on top of TCP/IP. They use TCP/IP to support typical application tasks, such as displaying web pages or running email servers.
SSL addresses three fundamental security concerns about communication over the Internet and other TCP/IP networks: