##Linux
If you've never heard of ssh-keys before, you'll need to generate one like this
$ ssh-keygen -t dsa
This creates a directory ~/.ssh/ and stores the key files
$ ls -l .ssh/
-rw------- 1 gnibbler gnibbler 668 Aug 22 2004 .ssh/id_dsa
-rw------- 1 gnibbler gnibbler 603 Aug 22 2004 .ssh/id_dsa.pub
You need to copy id_dsa.pub to the RPi. There is a very easy way to do this using a helper script.
$ ssh-copy-id -i ~/.ssh/id_dsa.pub [email protected]
You'll need to type the pi user password one last time
Next time you log in, you won't be prompted for a password
$ ssh [email protected]
Linux raspberrypi 3.1.9+ #174 PREEMPT Sun Jul 22 19:04:28 BST 2012 armv6l
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Type 'startx' to launch a graphical session