Password cracking is the process of attempting to gain Unauthorized access to restricted systems using common passwords or algorithms that guess passwords. In other words, it’s an art of obtaining the correct password that gives access to a system protected by an authentication method.
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Password cracking employs a number of techniques to achieve its goals. The cracking process can involve either comparing stored passwords against word list or use algorithms to generate passwords that match
In this Tutorial, we will introduce you to the common password cracking techniques and the countermeasures you can implement to protect systems against such attacks.
Topics covered in this tutorial
What is password strength?
Password strength is the measure of a password’s efficiency to resist password cracking attacks. The strength of a password is determined by;
Length: the number of characters the password contains.
Complexity: does it use a combination of letters, numbers, and symbol?
Unpredictability: is it something that can be guessed easily by an attacker?
Let’s now look at a practical example. We will use three passwords namely
1. password
2. password1
3. #password1$
For this example, we will use the password strength indicator of Cpanel when creating passwords. The images below show the password strengths of each of the above-listed passwords.
Note: the password used is password the strength is 1, and it’s very weak.
Note: the password used is password1 the strength is 28, and it’s still weak.
Note: The password used is #password1$ the strength is 60 and it’s strong.
The higher the strength number, better the password.
Let’s suppose that we have to store our above passwords using md5 encryption. We will use an online md5 hash generator to convert our passwords into md5 hashes.
The table below shows the password hashes
Password
MD5 Hash
Cpanel Strength Indicator
password
5f4dcc3b5aa765d61d8327deb882cf99
1
password1
7c6a180b36896a0a8c02787eeafb0e4c
28
#password1$
29e08fb7103c327d68327f23d8d9256c
60
We will now use http://www.md5this.com/ to crack the above hashes. The images below show the password cracking results for the above passwords.
There are a number of techniques that can be used to crack passwords. We will describe the most commonly used ones below;
Dictionary attack– This method involves the use of a wordlist to compare against user passwords.
Brute force attack– This method is similar to the dictionary attack. Brute force attacks use algorithms that combine alpha-numeric characters and symbols to come up with passwords for the attack. For example, a password of the value “password” can also be tried as p@$$word using the brute force attack.
Rainbow table attack– This method uses pre-computed hashes. Let’s assume that we have a database which stores passwords as md5 hashes. We can create another database that has md5 hashes of commonly used passwords. We can then compare the password hash we have against the stored hashes in the database. If a match is found, then we have the password.
Guess– As the name suggests, this method involves guessing. Passwords such as qwerty, password, admin, etc. are commonly used or set as default passwords. If they have not been changed or if the user is careless when selecting passwords, then they can be easily compromised.
Spidering– Most organizations use passwords that contain company information. This information can be found on company websites, social media such as facebook, twitter, etc. Spidering gathers information from these sources to come up with word lists. The word list is then used to perform dictionary and brute force attacks.
Spidering sample dictionary attack wordlist
Password cracking tool
These are software programs that are used to crack user passwords. We already looked at a similar tool in the above example on password strengths. The website www.md5this.com uses a rainbow table to crack passwords. We will now look at some of the commonly used tools
John the Ripper
John the Ripper uses the command prompt to crack passwords. This makes it suitable for advanced users who are comfortable working with commands. It uses to wordlist to crack passwords. The program is free, but the word list has to be bought. It has free alternative word lists that you can use. Visit the product website http://www.openwall.com/john/ for more information and how to use it.
Cain & Abel
Cain & Abel runs on windows. It is used to recover passwords for user accounts, recovery of Microsoft Access passwords; networking sniffing, etc. Unlike John the Ripper, Cain & Abel uses a graphic user interface. It is very common among newbies and script kiddies because of its simplicity of use. Visit the product website http://www.softpedia.com/get/Security/Decrypting-Decoding/Cain-and-Abel.shtml for more information and how to use it.
Ophcrack
Ophcrack is a cross-platform Windows password cracker that uses rainbow tables to crack passwords. It runs on Windows, Linux and Mac OS. It also has a module for brute force attacks among other features. Visit the product website http://ophcrack.sourceforge.net/ for more information and how to use it.
Password Cracking Counter Measures
An organization can use the following methods to reduce the chances of the passwords been cracked
Avoid short and easily predicable passwords
Avoid using passwords with predictable patterns such as 11552266.
Passwords stored in the database must always be encrypted. For md5 encryptions, its better to salt the password hashes before storing them. Salting involves adding some word to the provided password before creating the hash.
Most registration systems have password strength indicators, organizations must adopt policies that favor high password strength numbers.
Hacking Activity: Hack Now!
In this practical scenario, we are going to crack Windows account with a simple password. Windows uses NTLM hashes to encrypt passwords. We will use the NTLM cracker tool in Cain and Abel to do that.
Cain and Abel cracker can be used to crack passwords using;
Dictionary attack
Brute force
Cryptanalysis
We will use the dictionary attack in this example. You will need to download the dictionary attack wordlist here 10k-Most-Common.zip
For this demonstration, we have created an account called Accounts with the password qwerty on Windows 7.
Password cracking steps
Open Cain and Abel, you will get the following main screen
Make sure the cracker tab is selected as shown above
Click on the Add button on the toolbar.
The following dialog window will appear
The local user accounts will be displayed as follows. Note the results shown will be of the user accounts on your local machine.
Right click on the account you want to crack. For this tutorial, we will use Accounts as the user account.
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The following screen will appear
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Right click on the dictionary section and select Add to list menu as shown above
Browse to the 10k most common.txt file that you just downloaded
Click on start button
If the user used a simple password like qwerty, then you should be able to get the following results.
Note: the time taken to crack the password depends on the password strength, complexity and processing power of your machine.
If the password is not cracked using a dictionary attack, you can try brute force or cryptanalysis attacks.
Summary
Password cracking is the art of recovering stored or transmitted passwords.
Password strength is determined by the length, complexity, and unpredictability of a password value.
Common password techniques include dictionary attacks, brute force, rainbow tables, spidering and cracking.
Password cracking tools simplify the process of cracking passwords.
Have you Downloaded a RAR File from the Internet and is File Password Protected?. Then I think you are looking for a Way to “Remove Password from RAR” File. Some sites do not provide Password for RAR Files, and For Password site owner ask you to Complete the Survey. Although some Survey Bypasseravailable, But still it’s not the good idea to spend time in bypassing the surveys. Or Maybe you encrypted a File for safety purpose and now you forget the Password.
There are two ways available to extract Encrypted RAR File. First Method – You can retrieve RAR Password using some Tools. Some RAR Password Cracker tools available, that claims to Retrieve Password. But if Password is strong (included numbers and special characters) then Password Cracker Software either not work or will take days to recover RAR Password. Second Method – You can decrypt RAR Files or Can remove Password from RAR using winrar password remover.
Contents
1 Remove Password from RAR File.
1.1 Method: 1 Crack RAR Password using Script.
Remove Password from RAR File.
Method: 1 Crack RAR Password using Script.
There is multiple RAR Password Cracker Software available to Crack Password. But almost all Software comes in the trial version, And to crack password it asks for Money. So, In this Article, I am going to tell you a Simple Method to create your own RAR Password Cracker Software.
But this Small Password Cracker Software, will only work if Password is in Numeric form. So, If you think or you know that your Password is in Numeric Form. Then you can follow this instruction to find out Password. The software will not remove Password from RAR File But will crack Password.
1. Press Windows + R hotkeys, and then on Run Window, type notepad.exe to open Notepad App.
Alternatively, you can use the Windows Search feature to open App.
2. Now, Copy Script from Comment section, And Paste it into the Notepad App.
UPDATE: Instead of the script, I have provided bat file download link in the comment section. So, no need to follow step 1 t 3.
3. After copying the script in Notepad App, Go to File > Save As.
First select Software location, After that in File Name Field, type rarpd.bat and Click on Save button.
4. After saving the rarpd.bat file Right Click on it, And open it as Administrator.
5. Now, Cracker software will ask you to Enter File Name, Type file name and hit Enter.
6. After entering the File Name, Software will ask you to enter the file location.
If you don’t know file location then Right Click on File and then Choose Properties option.
In Properties Window you can see the location of File.
Copy the file location and Paste it into the Software, Now Press Enter Key.
Now, You”ll able to see some binary numbers in Software. Give Software some time and it will Crack Password for you. Normally it takes 10 minutes to crack four digit numeric Password.
How it Works?.
It is a Batch File Code, that works for Numeric Passwords Only (No Letters or Symbols). This Small Program tries multiple combinations of digits, to open RAR File. If you look at the Script, You”ll find out that, Software increase the Password field by 1 in every cycle. That means, If Password has many digits, Then program Will take longer time for decryption.
If you know some basic coding then you can Create a Script, to Crack letters and symbol Password. And If you’re not a Developer and your Password is in mix format then next method is for you.
Method: 2 Convert RAR file into Zip format.
If the Above mentioned program is Unable to Decrypt RAR File Password. Then you can try out this method to remove Password from RAR File. Although this is an old method that doesn’t work for Some RAR Files. But still, you can try this method, If The file is small.
On the Internet, Dozens of File Converter tools available, Just Search Google for “RAR to Zip Converter”. And then upload the file to converter site and, Site will provide you download link to your uploaded file in Zip Format.
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Note:Some File Converter tools will give you Error “File is Password Protected”. So keep trying Other online converter tools, But if the file is too big then don’t use this Method.
Method: 3 Use Best RAR Password Cracker.
The First Method only works for numeric keys, But with this method, you can crack any type of Password. In this method am going to tell you about a Password Cracker Software, Which allows performing – Dictionary Attack and Bruteforce Attack.
The best part about this software is, It is completely Free. It doesn’t remove password from RAR File But tries the combination of Alphabets and Digits to Crack Password. And, If you really want to crack password then you need to keep patience. Because if the password is too long then the software will take much time.
First, Download RAR Password CrackerSoftware from its Official Site.
Now, Install it on your Computer and Open it as Administrator. In Cracker Wizard select “Create New Project” and click on Next Button.
Use Load RAR Archive option and select encrypted RAR File to Crack Password. After loading archive, Software will show you files available in RAR File. Select all files that you want to Extract, And then click on “Add to Project“.
After selecting the project click on the Next button, And you”ll get two option.
Dictionary Attack option
Bruteforce Attack option
Choose Bruteforce Attack option and click on Next, On Next Window click on Add button and choose digit and alphabets.
Now set minimum and maximum length of your Password, And click on Next Button. On next window select path of File, And then click on Finish Button.
After completing all process, Now the software will start cracking the Password.
Conclusion: Winrar Password Remover.
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These are three methods available that allow to Crack or Remove RAR File Password. On Youtube, You can find out many videos related to this. But only this three method is working, So you can try any of this method. If you think your password is numeric then the first method is for you. But if you think your Password is alphabets or in special characters then you can try the third method. If you know any other better way to crack RAR Password, then feel free to Comment.