Secure SSH, CVS, SCP Without Password Prompt

1. Suppose the domain name of your server is server, and your login name loginname.
2. On the client, generate a public and private key.
    ssh-keygen -C loginname@server -t dsa 
   When asked for a password, simply press return. The private key is stored in
    ~/.ssh/id_dsa
   and the public key in
    ~/.ssh/id_dsa.pub
3. Copy the public file to the server with
    scp ~/.ssh/id_dsa.pub loginname@server:~/
4. Login on the server with
    ssh loginname@server
5. Append the copied file to ~/.ssh/authorized_keys with
    cat ~/id_dsa.pub >>~/.ssh/authorized_keys