ZyXEL Communications NWA1000 Series, User Manual, Page: 149 / 263

Chapter 15 System
NWA1000 Series User’s Guide
149
Figure 92 SSH Communication Over the WAN Example
15.5.1 How SSH Works
The following figure is an example of how a secure connection is established between two remote hosts
using SSH v1.
Figure 93 How SSH v1 Works Example
1
Host Identification
The SSH client sends a connection request to the SSH server. The server identifies itself with a host key.
The client encrypts a randomly generated session key with the host key and server key and sends the
result back to the server.
The client automatically saves any new server public keys. In subsequent connections, the server
public key is checked against the saved version on the client computer.