A Virtual network computing (VNC) server receives a client launch request from a VNC client and provides a log-in page for display at the VNC client. The log-in page includes a graphical representation of a keyboard having a plurality of keys. Individual key designations at the keyboard are unique and are generated randomly in response to the client launch request. The VNC server receives pointing device movement coordinates from the VNC client; the movement coordinates indicating selection of individual keys at the keyboard by a user of the VNC client.