title: DH vs. DHE and ECDHE and perfect forward secrecy
body: <p>Does Diffie-Hellman (DH) provide perfect forward secrecy? or is it a feature for Ephemeral Diffie-Hellman (DHE) only ?
  Is Elliptic Curve Ephemeral diffie-Hellman (ECDHE) is better than DHE ? </p>