gHacks Technology News | Latest Tech News, Software And Tutorials » nt http://www.ghacks.net A technology news blog covering software, mobile phones, gadgets, security, the Internet and other relevant areas. Fri, 10 Feb 2012 09:07:37 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Automatic compression of the Registryhttp://www.ghacks.net/2007/10/19/automatic-compression-of-the-registry/ http://www.ghacks.net/2007/10/19/automatic-compression-of-the-registry/#comments Fri, 19 Oct 2007 08:43:27 +0000 Martin Brinkmann http://www.ghacks.net/2007/10/19/automatic-compression-of-the-registry/ I described a way to compress the Windows registry manually yesterday. The process itself was not really complicated but it involved booting into DOS to complete the changes to the registry that have been made by the process. Tehmul (more of that please) commented in that article pointing to a software named NTREGOPT (NT Registry Optimizer) which would optimize the full registry and perform the replacement during the next system boot automatically.

This is of course a far better method of compressing the registry which is why I decided to write an article about NTREGOPT. Just run the software after downloading and installing it. It will automatically check and compress the registry displaying information about the reduction at the end of the process.

nt registry optimizer

As you can see the size of the optimized registry is about 5 Megabytes smaller than the size of the unoptimized registry. The registry files have been replaced during the system boot which is far more comfortable than having to boot into DOS to give the restore commands manually.

Read More:

NTREGOPT

]]> http://www.ghacks.net/2007/10/19/automatic-compression-of-the-registry/feed/ 4 How to display all Windows passwordshttp://www.ghacks.net/2007/02/23/how-to-display-all-windows-passwords/ http://www.ghacks.net/2007/02/23/how-to-display-all-windows-passwords/#comments Fri, 23 Feb 2007 09:42:31 +0000 Martin Brinkmann http://www.ghacks.net/2007/02/23/how-to-display-all-windows-passwords/ Just a few days ago I was describing a method that would allow anyone to change passwords for all windows accounts using a boot CD and a program called NT Passwords. This is great if it does not matter if you change the password for, lets say, the administrators account. It might however be sometimes important to get into an account without the owner of the account knowing – and he would surely find out if his password would not be working anymore.

ophcrack windows nt password recovery

Ophcrack is a tool that is able to quickly display Windows NT account passwords using Rainbow Tables instead of brute forcing the passwords. While it could take years to brute force a password that uses letters, numbers and special chars it takes only minutes to do so with Ophcrack.

Ophcrack can be downloaded with several different table sets. The default live cd is able to reveal passwords with alphanumeric chars only. If no passwords are revealed using this method you should download different table sets which support other chars as well.

ophcrack

Runs on Windows, Linux/Unix, Mac OS X, …
» Cracks LM and NTLM hashes.
» Free tables available for Windows XP and Vista.
» Brute-force module for simple passwords.
» Audit mode and CSV export.
» Real-time graphs to analyze the passwords.
» LiveCD available to simplify the cracking.
» Loads hashes from encrypted SAM recovered from a Windows partition, Vista included.
» Free and open source software (GPL).

Two additional table sets can be downloaded from the Ophcrack website. The first is 720 megabytes and should only be used on machines with at least 500 megabytes of ram. A smaller one with only 388 megabytes can be downloaded for machines with less than that amount of ram.

A new version of Ophcrack was released just four days ago.

Update: Ophcrack has not been updated for some time. The last update dates back to 2009 which was a bug fix release.

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