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user passwords

Password cracking seems like a difficult task but these techniques make it as simple. We’ll show you some software which cracks windows, mac, and linux user account passwords in a just a few minutes. The programs basically do all the hard work for you as noted in this tutorial.

Breaking into a computer is an illegal activity but it does help to know how to re-access your own equipment. So, this post is for informational and ethical purposes only! This how-to covers three OS we use and the methods to crack the log-in passwords.


For Windows OS, Ophcrack is the tool of choice. It is a free Windows Password cracker based on Rainbow Tables. It has a GUI which makes it easier to run. The software can decipher passwords up to 14 characters in length in a quick 10 seconds.

To use Ophcrack one needs to download the Ophcrack ISO and burn it to a CD (or load it via a USB drive). Run the CD by loading it in the tray and restarting the computer with the power switch. Switch to the BIOS options and set the computer to boot from the CD Drive. The computer boots up and reads the Ophcrack CD which then proceeds to break the password. Use this password to log into the machine.

Ophcrack is a multi-platform software and so can be used for Mac and Linux too.

Mac OS X

Apart from Ophcrack, another simple method involves using the Mac OS X installation CD (for v10.4). Insert and reboot to display UTILITIES. Choose RESET PASSWORD to get a new one. Login using this password. To reset the password in Mac OS X 10.5, reboot the computer and press COMMAND + S.

At the prompt type in:

sck -fy
mount -uw /
launchctl load /System/Library/LaunchDaemons/

dscl . -passwd /Users/UserName newpassword

Login with the new reset password.


Power on the computer, press the ESC key and on the boot loader (GRUB) screen select the ‘Recovery Mode’. Press the ‘B’ Key to enter the single user mode. At the default prompt, type in ‘passwd’ and key in your new password. For access to a single account on the system type ‘passwd username’ replacing ‘username’ with the login name for the account you would reset the password for.

A lesson in cracking is also a lesson in security. Joe Tech’s article advocates the use of encryption (Blowfish or AES-128) as a failsafe against password breach.


The Open Source Security Testing Methodology Manual 

It documents more than 100 attacks to for security testing. including-

information and data controls, personnel security awareness levels, fraud and social engineering control levels, computer and telecommunications networks, wireless devices, mobile devices, physical security access controls, security processes, and physical locations such as buildings, perimeters, and military bases.