vncpasswd(1) Virtual Network Computing vncpasswd(1)

NAME

vncpasswd - change the VNC password

SYNOPSIS

vncpasswd [passwd-file]
vncpasswd -f

DESCRIPTION

vncpasswd allows you to set the password used to access VNC desktops.
Its default behavior is to prompt for a VNC password and then store
an obfuscated version of this password to passwd-file (or to
$HOME/.vnc/passwd if no password file is specified.) The vncserver
script runs vncpasswd the first time you start a VNC desktop, and it
invokes Xvnc with the appropriate -rfbauth option. vncviewer can
also be given a password file to use via the -passwd option.

The password must be at least six characters long (unless the -f
command-line option is used-- see below), and only the first eight
characters are significant. Note that the stored password is not
encrypted securely - anyone who has access to this file can trivially
find out the plain-text password, so vncpasswd 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.

OPTIONS

-f Filter mode. Read a plain-text password from stdin and write
an encrypted version to stdout. Note that in filter mode,
short or even empty passwords will be silently accepted.

A view-only password must be separated from the normal
password by a newline character.

FILES

$HOME/.vnc/passwd
Default location of the VNC password file.

SEE ALSO

vncviewer(1), vncserver(1), Xvnc(1) vncconfig(1),
https://www.tigervnc.org

AUTHORS

Tristan Richardson, RealVNC Ltd., Antoine Martin, D. R. Commander and
others.

VNC was originally developed by the RealVNC team while at Olivetti
Research Ltd / AT&T Laboratories Cambridge. TightVNC additions were
implemented by Constantin Kaplinsky. Many other people have since
participated in development, testing and support. This manual is part
of the TigerVNC software suite.

TigerVNC vncpasswd(1)