sshd session establishment process

1. Establish a client connection

2. Exchange public host keys

3. Disconnect

Summarize the connection process:

• Client connection request on port 22.
• The server process spawns a child process.
• Exchange host keys between server processes.
• Exchange session keys and local host keys with the client.
• Determine the encryption technology to be adopted between the servers.
• Transmission of encrypted data.
• Disconnect.