Yup, I agree with lacloai, use ssh. Try following resources if you are new to SSH

Howto Linux / UNIX setup SSH with DSA public key authentication (password less login)

SSH Public key based authentication - Howto

How to Tunnel X Windows Securely over SSH

How to: Allow telnet and ssh through iptables under Linux

Don't use rlogin or other r services they are insecure.

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