ZyXEL ES-3124PWR User Guide - Page 252
SSH Overview, How SSH works
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Chapter 30 Access Control 30.4 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 148 SSH Communication Example 30.5 How SSH works The following table summarizes how a secure connection is established between two remote hosts. Figure 149 How SSH Works 252 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. ES-3124 Series User's Guide