SSL

A VPN-SSL uses the SSL encryption protocol to insure data privacy and integrity between the two parts because the protocol provides data encryption and authentication. SSL is based on TCP protocol and uses the Public key cryptography concept (introduced by Diffie-Hellman in the 1970 decade).

This concept specifies that each part has a Private Key and a Public Key that can be distributed by people that want to have encrypted communication. Encrypted data with the Public Key are only decrypted by the corresponding Private Key. Encrypted data with the Private Key are only decrypted by the corresponding Public Key.

After clicking on SSL, the list of VPN SSL servers is shown. To configure the tunnel you must click on it (Figure 4.19).

Figure 4.19: VPN - SSL Settings