ZyXEL Communications ZyXEL ZyWALL 35 - Manual (Page 362)

ZyWALL 35 User’s Guide
360 Chapter 21 Remote Management
Figure 183 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 184 SSH Communication Example
21.6 How SSH works
The following table summarizes how a secure connection is established between two remote
hosts.