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vncpasswd(1)

TigerVNC

tigervnc

Suite of VNC servers and clients. Based on the VNC 4 branch of TightVNC.

tigervnc-server-minimal

A minimal installation of TigerVNC server

xorg-x11-Xvnc

TigerVNC implementation of Xvnc

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.
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