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CentOS 7.0 - man page for vncpasswd (centos section 1)

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 charac- ters 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.
FILES
$HOME/.vnc/passwd Default location of the VNC password file.
SEE ALSO
vncviewer(1), vncserver(1), Xvnc(1) vncconfig(1), http://www.tigervnc.org
AUTHORS
Tristan Richardson, RealVNC Ltd. Antoine Martin D. R. Commander 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 participated in development, testing and support. TigerVNC 09 Jul 2010 vncpasswd(1)