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有些東西，不用真的會忘記，寫下也不見得記得寫在哪裡，反正現在都靠Google+Blog~
用這招不一定是為了安全，主要是使用TkCVS的時候才不用每次切一個目錄就打一次帳號密碼，這樣太誇張了~

首先下指令產生rsa key：

結果如下：
kuster@ivan-ubuntu910:~$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/kuster/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/kuster/.ssh/id_rsa. Your public key has been saved in /home/kuster/.ssh/id_rsa.pub. The key fingerprint is: 23:4e:d6:e8:1d:48:57:fd:a7:1e:c5:03:ad:e2:22:91 kuster@ivan-ubuntu910 The key's randomart image is: +--[ RSA 2048]----+ | .. . | | . .. . | | . o .o. | | . E . ...+| | * S . . +.| | = + + . o | | o o . . . | | . | | | +-----------------+

然後會在目錄"~/.ssh"找到public key，檔名是"id_rsa.pub"，將之傳到你要登入的機器，可以使用scp指令，如下：

接著連線到遠端，把public key增加到"~/.ssh/authorized_keys"，指令如下：

之後登入就不用輸入密碼了，但是如果換了一台機器就要重新執行一次手續