Ssh Overview; How Ssh Works; Figure 171 Common Zywall Certificate; Figure 172 Ssh Communication Example - ZyXEL Communications ZyWALL 5 User Manual

ZyWALL 5 User's Guide

Figure 171 Common ZyWALL Certificate

21.5 SSH Overview

Unlike Telnet or FTP, which transmit data in clear text, SSH (Secure Shell) is a secure
communication protocol that combines authentication and data encryption to provide secure
encrypted communication
between two hosts over an unsecured network.

Figure 172 SSH Communication Example

21.6 How SSH works

The following table summarizes how a secure connection is established between two remote
hosts.
338 Chapter 21 Remote Management