ZyXEL MES3500-24 User Guide - Page 302
How SSH works
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Chapter 38 Access Control 38.6 How SSH works The following table summarizes how a secure connection is established between two remote hosts. Figure 179 How SSH Works 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. 2 Encryption Method Once the identification is verified, both the client and server must agree on the type of encryption method to use. 3 Authentication and Data Transmission After the identification is verified and data encryption activated, a secure tunnel is established between the client and the server. The client then sends its authentication information (user name and password) to the server to log in to the server. 302 MES3500-24/24F User's Guide