Perfect Forward Secrecy
From my understanding VyprVPN does not have Perfect Forward Secrecy in it's OpenVPN or Chameleon encryptions. That is now a must.
I wonder why the clients have to tell the"Security Experts," (According to them) stiff like this.... This is their job to know.
This means that your encrypted traffic cannot be captured and decrypted later if the encryption key from a subsequent session gets compromised. With each connection, we generate a new encryption key, so a key is never used for more than one session.