If you're talking about straight out of the box VNC, it does not provide any encryption (UltraVNC does however, and RealVNC does to, for the commercial package).
FreeNX is used over ssh so, it's secure by default I'd say, but you can also tunnel VNC through ssh.
If you're talking about straight out of the box VNC, it does not provide any encryption (UltraVNC does however, and RealVNC does to, for the commercial package).
FreeNX is used over
ssh
so, it's secure by default I'd say, but you can also tunnel VNC through ssh.