ZyXEL Communications ZyXEL ZyWALL P1 - Manual (Page 201)

ZyWALL P1 User’s Guide
200 Chapter 13 Remote Management
Figure 95 Common ZyWALL Certificate
13.5 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 96 SSH Communication Example
13.6 How SSH works
The following table summarizes how a secure connection is established between two remote
hosts.