VNC User Guide - RealVNC

Chapter 7: Making Connections Secure
— View only access, select View-only. Any keypresses or mouse movements made by the user will
have no effect.
2. Turn on the Guest Login option on the VNC Server shortcut menu. More on this menu. A tick appears:
Note: If the Guest Login menu option is turned off, Guests cannot connect. Note that other connected
users can turn this menu option on and off. When VNC Server starts, Guest Login is turned off by
default.
3. Inform users that they must enter Guest in the Username field of the VNC Viewer - Authentication
dialog. More on this dialog. The Password field, however, should be left empty.
When a Guest connects, a connection prompt appears on the host computer:
A host computer user must accept the connection request within ten seconds or it will be automatically
rejected. For more information on connection prompts, see Preventing particular users connecting on
page 113.
Changing the encryption rules
By default, all network communications to and from a host computer running VNC Server (Enterprise) or
VNC Server (Personal) are encrypted using 128-bit AES technology. Identity is certified using 2048 bit RSA
public/private keys.
Note: VNC Server (Free) does not support encryption. Upgrade the host computer to VNC Server
(Enterprise) or VNC Server (Personal) if security is important to you.
For VNC Server (Enterprise), you can:
• Relax the encryption rules if you are sure all potential client computers are within a secure network
environment, and that eavesdropping is impossible. This may improve performance. It may also allow
older versions of VNC Viewer, or VNC-compatible Viewer technology, that do not support encryption to
connect.
Note: Even if encryption is turned off, passwords are still encrypted.
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