> I understand there is a challenge/response mechanism used in RealVNC
> Free Edition, but is this authentication session encrypted? What
> safeguards are in place and how do they compare with a 
> default setup of Windows 2K/3K, for example?

VNC Free Edition uses a simple challenge-response scheme based on encrypting
a random challenge with up to 8 bytes of password data.

VNC Personal & Enterprise Editions set up an encrypted session between
viewer & server before exchanging passwords, which may be up to 255
characters in length.

Regards,

Wez @ RealVNC Ltd.
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