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.TH vncpasswd 1 "05 May 2006" "TightVNC" "Virtual Network Computing"
.SH NAME
vncpasswd \- change a VNC password
.SH SYNOPSIS
.B vncpasswd
.RI [ passwd-file ]
.SH DESCRIPTION
.B vncpasswd
allows you to set the password used to access VNC desktops. It stores an
obfuscated version of the password in the given file (default
$HOME/.vnc/passwd). The \fBvncserver\fP script runs \fBvncpasswd\fP the first
time you start a VNC desktop, and invokes \fBXvnc\fP with the appropriate
\fB\-rfbauth\fP option. \fBvncviewer\fP can also be given a password file to
use via the \fB\-passwd\fP option.
The password must be at least six characters long, and only the first eight
characters are significant. Note that the stored password is \fBnot\fP
encrypted securely - anyone who has access to this file can trivially find out
the plaintext password, so \fBvncpasswd\fP always sets appropriate permissions
(read and write only by the owner). However, when accessing a VNC desktop a
challenge-response mechanism is used over the wire making it hard for anyone to
crack the password simply by snooping on the network.
.SH FILES
.TP
$HOME/.vnc/passwd
Default location of the VNC password file.
.SH SEE ALSO
.BR vncviewer (1),
.BR vncserver (1),
.BR Xvnc (1)
.BR vncconfig (1),
.br
http://www.tightvnc.com
.SH AUTHOR
Tristan Richardson, RealVNC Ltd.
VNC was originally developed by the RealVNC team while at Olivetti
Research Ltd / AT&T Laboratories Cambridge. TightVNC additions was
implemented by Constantin Kaplinsky. Many other people participated in
development, testing and support.
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