Computer Password Cracking Methods Conclusion (1)

The administrator always confront with problems about password forget or password missing, the followings are the collection of some methods of password cracking. Power-on password is the first one we’ll meet, so let’s star from CMOS password cracking.  

1.       CMOS cracking

Even though the types of CMOS are various, their encryption methods are basically the same. The general cracking methods start from “hard” and “soft” aspects.

1) “Hard” remove method

The principle of this method is to process the CMOSRAM on the motherboard with electro discharge treatment, which makes the contents lost owing to lack of normal power supply parameters stored in CMOSRAM lacks normal power supply, and thus to remove CMOS password. Some newspaper or sites make much introduction about how to crack CMOS password, and the operation is very easy. But we will introduce an alternative technique, which is the method that a number of computer users like to use. This method is also simple: open the case, and pull off the hard drive or CD-ROM, floppy drive data cable from the motherboard, and then start the computer, BIOS will report an error during self-test and then automatically enter CMOS, at this time you can reset the BIOS content.

2) “Soft” remove method

Strictly speaking, the “soft” remove method is not as thorough as hard remove method, but it’s also very effective. CMOS password according to need can be divided into common user password and super user level password. The former simply restrict the changes to the BIOS, but it allows to normal start computer and run other software; but the latter completely ban access to a computer and BIOS.

1> crack common user password

First of all, boost a computer with DOS, input debug and then press enter in dos command line, and then use the data of listed methods to remove the CMOS password, restart the computer, the system will tell you the CMOS parameter is missing and require you to reset CMOS parameters. After testing, this is a very effective method.

2> crack the super user password

Here we need to resort to external tools. We choose the most classic BiosPwds, a freeware, which is suitable for computer users who are not familiar with dos.

2.       Crack system password

System password is the password you use to log on the operating system, it provides protection for your computer and protect your computer from unauthorized users’ accesses, so as to ensure computer and confidential data security.

1. Windows98/ME system login password

1> cancel

The easiest way is to enter nothing when logging on the password, directly click on “cancel” to enter the operating system. But this way makes you can only access resources in local computer but can’t access the network resources if your computer is a part of LAN.

2> add users

When you are blocked from the system owing to the password, you may as well add a user for the system, and then log in. Click “Start”->”Settings”->”Control Panel”, and then double click on “user”, open the “User Properties” dialog box. Then, input user name, password and customized settings following the prompts, and then click on “Finish”.

3> delete “PWL” file

Delete the .PWL file under the Windows installation directory and all personal information files under Profiles subdirectory, and then re-boost Windows, the system will pop up a password setting box without user name. You don’t need to input any content, just click on “Ok” and tehn Windows password will be deleted.

4> modify the registry

Run the Registry Editor, open the registry database “HKEY_LOCAL_MACHINE \ Network \ Logon” and change “username” to “0″, then restart the system, which also allows you to remove the password.

2. Crack WindowsNT password

If you have normal user account, there’s a simple way to get NTAdministrator account: first rename the logon.scr under c: \ logon.scr winntsystem32 as logon.old for backup, and tehn rename usrm gr.exe as logon.scr and restart. logon.scr is a loaded program when starting system, after restarting, the computer won’t appear logon password interface, but the user manager, at this time you can add yourself into admin group.

3. Windows2000 password

Use boot disk to boot computer or enter another operating system (eg Windows98), find the folder “X:\DocumentsandSettings\Administrator” (X is the disk where Windows2000 is placed), delete “Cookies” folder under this folder and then restart the computer, so you can quickly logon Windows2000 without password.

The above methods are used by admin to cope with problems of forgetting password or missing password, they shouldn’t be used to break other people’s computer. And the computer users who are afraid other people will invade computers without authority and steal personal information should take extra protection for the confidential and sensitive files and documents, such as using file encryption solution to protect files and folders.