ssh and scp are very useful for making sure you work in a pretty secure environment. But sometimes it can be a hassle if you have to keep on keying in your password to login many times to the server or you might need to write a backup script but do not want to write your password in the script then I have found a solution at https://help.ubuntu.com/community/SSHHowto#public-key-auth.
Basically what you need to do is copy your public key to the authorized keys file on the server. If you haven't got a public key yet just type in:
ssh-keygen -t dsa
And that will create an id_dsa.pub file in your ~/.ssh folder (By default, you can set it in other places if you want). Anyway, copy the content of that file (it should be just one line) into the ~/.ssh/authorized_keys file on the server you want to login. Now whenever you ssh username@server you'll access it straight away without any password. And scp also works without password so you can write those scripts.
Update: dsa doesn't seem to work anymore. Try using rsa.
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