ssh-keygen

SSH1: RSA1
SSH2: RSA2, DSA

Updated:

user=user
server=server
ssh-keygen -t rsa
scp ~/.ssh/id_rsa.pub $user@$server:~
ssh $user@$server "mkdir -p ~/.ssh/ ; cat ~/id_rsa.pub >> ~/.ssh/authorized_keys; rm -v ~/id_rsa.pub"

1. Generate key
   ssh-keygen -t dsa
   ssh-keygen -t rsa1
   ssh-keygen -t rsa2 (unknown key type on Ubuntu 8.04)
2. Upload to server
   scp ~/.ssh/*.pub <server>:~/.ssh/
3. Import the public key to authorized_keys on Server
   cat ~/.ssh/*.pub >> ~/.ssh/authorized_keys

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ssh keygen 免輸入密碼
http://plog.longwin.com.tw/post/1/293

SSH 免密碼登入
http://josephjiang.com/article/understand-ssh-key/

[Linux] SSH Key 更換作業...
http://antontw.blogspot.com/2008/05/linux-ssh-key.html