Provided by: chntpw_0.99.2-4_i386
chntpw - utility to overwrite Windows NT/2000 SAM passwords
chntpw [options] <samfile> [systemfile] [securityfile] [otherreghive]
This manual page documents briefly the chntpw command. This manual
page was written for the Debian distribution because the original
program does not have a manual page.
chntpw is a utility to view some information and change user passwords
in a Windows NT/2000 SAM userdatabase file. It is not necessary to know
the old passwords to reset them. In addition it contains a simple
registry editor (same size data writes) and hex-editor with which the
information contained in a registry file can be browsed and modified.
-h Show summary of options.
Username to change. Default is Administrator
-l List all users in the SAM database.
-i Interactive: list all users (as per -l) and then ask for the
user to change.
-e Registry editor with limited capabilities.
-d Use buffer debugger.
-t Show hexdumps of structs/segments (deprecated debug function).
chntpw sam system
Opens registry hives sam and system and change administrator
account. This will work even if the name has been changed or it
has been localized (since different language versions of NT use
different administrator names).
chntpw -u jabbathehutt mysam
Prompts for password for jabbathehutt and changes it in the
mysam registry file, if found (otherwise do nothing)
If you are looking for an automated procedure for password recovery,
you might look at the bootdisks provided by the upstream author at
There is more information on how this program works available at
/usr/share/doc/chntpw registry works, what are syskeys and some other
This manual page was written by Javier Fernandez-Sanguino Peña
<email@example.com>, for the Debian GNU/Linux system (but may be used by
30th May 2002 CHNTPW(8)