When you connect to the OS X 10.6 and higher, all your mouse and keyboard events and authentication credentials are encrypted by default.
Screen Sharing server also supports full encryption since OS X 10.8 Mountain Lion.
You can enable the secure mode where all the data transmitted between Remotix and remote computer will be encrypted. Note
that it might slightly affect the performance.
Choose a server in the list of stored servers.
Press Edit... button.
Open VNC Settings pane.
Select All Data (slower) in the list of the encryption types.