uses fast cryptography algorithms with 128bit security margin, strong
mutual zero-knowledge authentication and perfect-forward secrecy
property. An attacker can not know anything from captured traffic, even
-if pre-shared key is compromised.
+if pre-shared key is compromised. Rehandshake is performed by client
+every 4 GiB of transfered data.
Also you can provide up and down scripts that will be executed after
either connection is initiated (up-script in background), or is went