On your linux server install OpenSSH if not already present.
#debian apt-get install openssh-server #redhat yum install openssh-server
Using Filezilla on a client enter the relavent details using the SSH protocol SFTP and user credentials setup on the server.
Filezilla will ask you if you want to trust the connection and will display the rsa key. SSH keys are generally stored in /etc/ssh/. You can view the rsa key on the server by typing:
ssh-keygen -lf /etc/ssh/ssh_host_rsa_key
For more direct remote management using SSH you can use cross-platfrom tools such as PuTTY or the FireSSH extension for the Firefox web browser