> I have no
> clue why VNC passwords are limited/truncated to eight characters, but it
> seems like that limitation makes the protocol not worth supporting at
> all, let alone worth promoting in System Settings.

The only VNC authentication mechanism standardized in RFC 6143 uses the 
password as a DES key, which limits it to 8 (7-bit) bytes.

The VNC protocol can, however, support several different kinds of 
authentication, and several have been defined as vendor extensions.  See e.g. 
http://sourceforge.net/p/tigervnc/code/HEAD/tree/rfbproto/rfbproto.rst#security-types
 .

Restricting to non-standard authentication types, would, of course, impact 
interoperability.
    Mirek
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