How Ssh Works - ZyXEL Communications GS2200-24 User Manual

Chapter 33 Access Control
to provide secure encrypted communication between two hosts over an unsecured
network.
Figure 150 SSH Communication Example

33.9.2.1 How SSH works

The following table summarizes how a secure connection is established between
two remote hosts.
Figure 151 How SSH Works
Host Identification
1
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.
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