使用下例中ssky-keygen和ssh-copy-id，僅需通過3個步驟的簡單設置而無需輸入密碼就能登錄遠程Linux主機。ssh-keygen 創建公鑰和密鑰。ssh-copy-id 把本地主機的公鑰復制到遠程主機的authorized_keys文件上。ssh-copy-id 也會給遠程主機的用戶主目錄（home）和~/.ssh, 和~/.ssh/authorized_keys設置合適的權限 。

步驟1: 用 ssh-key-gen 在本地主機上創建公鑰和密鑰

ligh@local-host$ ssh-keygen -t rsaEnter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key]  Enter passphrase (empty for no passphrase): [PRess enter key]Enter same passphrase again: [Pess enter key]Your identification has been saved in /home/jsmith/.ssh/id_rsa.Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub.  The key fingerprint is: 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9  ligh@local-host

步驟2: 用 ssh-copy-id 把公鑰復制到遠程主機上

ligh@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.0.3ligh@remote-host‘s passWord:Now try logging into the machine, with ―ssh ?remote-host‘‖, and check in:  .ssh/authorized_keys to make sure we haven‘t added extra keys that you weren‘t expecting.

[注: ssh-copy-id 把密鑰追加到遠程主機的 .ssh/authorized_key 上.]

ligh@local-host$ ssh remote-host  Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2  ligh@remote-host$  

[注: 你現在已經登錄到了遠程主機上]