Go to the Open SSH website and then follow the links to the Linux OS version. Download either the RPM version, or the source version if you want to compile it yourself from one of the mirrors. If you only want to connect to other systems, you need the clients RPM. If you also intend to allow ssh access to your system, you will need the server RPM as well.

Once they are downloaded, install the rpms and then do some tests. If you want the SSH server to run by default, add the following to /etc/rc/rc.local:

   echo "Starting sshd"
   /usr/sbin/sshd        # depending on where sshd got installed

Test the various clients, including ssh, sftp and scp to insure that they work.

Finally, if you want to be persnicity about who can access your account on a particular host, or a particular host, you can use ssh-keygen to generate public keys with pass-phrases for higher levels of protection.