Common password cracking methods on computers

I. Forgot the system password

If you forget the system password in the CMOS settings, you will not be able to start the machine. The solution is to open the chassis, remove the battery, connect the positive and negative poles, and discharge the CMOs, clear all the content in CMOS (including the password, of course), and then restart the system to set it.

Note: For some motherboard With the CMOS Password clear jumper, refer to the motherboard manual to transient the jumper, so that the CMOS password can also be cleared.

Ii. Forget the setup Password

If you forget the password, you cannot set CMOS. If you can use a computer but cannot enter the CMOS settings, you can solve this problem: Start debug in DOS state, and then enter the following command to manually clear the setup password:

_ O 70 16

_ O 71 16

_ Q

You can also use the CMOS password cracking software to display the CMOS password. There are many such software, such as cmospwd, it supports various BIOS such as Acer, Ami, award, Compaq, Dell, IBM, Packard Bell, Phoenix, and Zenith ami. The CMOS password is displayed when the program is started in DOS.

3. Forget the Windows logon Password

Countermeasure under winme/98: Press F8 to start DOS, and then delete *. the PWL password file, and all the personal information files in the profiles subdirectory. After windows is restarted, a password setting box containing no user name is displayed, without any input, click OK to delete the logon password.

In addition, modify the userprofiles under the HKEY_LOCAL_MACHINE, network, and logon branches of the registry database to "0", and then restart Windows to achieve the same purpose.

Countermeasure in WINXP/2000: Delete the Sam file in the system installation directory system32 config and restart the system. At this time, the administrator account has no password. log on to the system with the Administrator account without entering any password, after entering the system, you can reset the login account password.

4. Forget the Windows Screen saver password

Solution: Press F8 after the instance is started, select safe mode to start, enter windows, right-click the blank area on the desktop, and select "properties"/screen protection from the shortcut menu, cancel "password protection.

5. Forget the Windows Power Management Password

You can also set a password for the Windows power management function. When this function is enabled, the system requires a password when it returns from the energy-saving status.

If you forget the password, you can use the method used to crack the Windows logon password.

6. Forget the Microsoft Office Password

Solution: use the software to crack the password of office documents, there are a lot of such software, such as aopr (download URL http://www.elcomsoft.com /), this software can simultaneously crack the passwords generated by Microsoft Office series Word, Excel, access, and other software. It can also crack word *. search for the password of the dot template file.

7. Forgot the WinZip compressed package Password

Solution: use the software uzpc (ultra zip password cracker) to retrieve the lost password. When using the software, you must first set an appropriate decryption method, such as "backdoor mode", "exhaustive mode", "dictionary mode", and "pattern matching mode, generally, the "brute force mode" is used, and the software tests all possible passwords until the final result is found.

8. Forgot the RAR compressed package Password

After forgetting the RAR compressed package password, you can download a crark software to crack it. It mainly uses the command line to crack the RAR compressed package password. Generally, you only need to use the "crark RAR compressed package file name" command directly and use the default parameters to crack it.

9. Forgot the QQ/ICQ Password

To protect your QQ password, apply for password protection immediately. If you forget your QQ password or the password is stolen, you only need to enter the correct information to retrieve it.

If you want to retrieve the ICQ password, you can use the software ICQ password revealer, which is a DOS command line utility. You only need to execute this file in the newdb sub-folder of the ICQ installation folder, then enter your uin as prompted on the screen, and the system will retrieve the "long-overdue" ICQ password.

10. Forget the Outlook Express Password

If you forget your password and cannot access the emails received by Outlook Express or use the address book, you can restart the computer, press F8, and select "safe mode ", you do not need a password to start OE again. Then you can create a new user (you cannot change the password) and import the information to the new user mailbox.

11. Forget the Foxmail account password

Solution: Eliminate the password of the forgotten Foxmail account. First open Foxmail, create an account (any account name, such as lacl1), and then exit Foxmail. run Windows Resource Manager and find the Foxmail \ mail \ lacl1 folder, which contains an account. stg. "STG" file; then run Foxmail again to open the account that forgot the password. Why is there no "password prompt box? Now you can directly open the account with the password forgotten, and there will be no less emails in the account!

12. view the "*" Password

Many passwords are displayed as "*" on the screen, so we cannot directly see the original characters of the password. If you use software dedicated to cracking the "*" password, you can find out the original characters of these passwords.

There are many such software. For example, you can use iopus password recovery in Win2000/WIN98 and password spectator pro in WINXP. When using the tool, you only need to open the "*" window, start the software, press the ctrl key, and press the left mouse button in the password column, the original characters of these "*" passwords are displayed.