Data Stream Encryption Plugin
UltraVNC features a Data Stream Modification (DSM) Plugin System allowing for any kind of operation on the data exchanged between client and server, from an external DLL (independent, not linked and not distributed with UltraVNC): additional rights checking, communication timing, data recording/persistence, encryption... it's up to the DLL developer.
The DSM Plugin system is a "tunnel" for the VNC connection.
Currently there are several versions of Encryption plugins available.
When using such plugins, all Ultr@VNC data streams are integrally encrypted, making your connection more secure.
A stable MSRC4 plugin and some OpenSSL based plugins in beta status are available
Please find more details and the downloads on the DSM Encryption plugins Web Site