beautypg.com

5 ssh overview, 6 how ssh works, 5 ssh overview 21.6 how ssh works – ZyXEL Communications ZyXEL ZyWALL 5 User Manual

Page 341

background image

ZyWALL 5 User’s Guide

340

Chapter 21 Remote Management

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.