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When password protected, the RAR file is encrypted with one of the strongest security levels, AES 256 or AES 128 (depending on version). [1] X Trusted Source Library of Congress Go to Source If you can’t open the RAR file because you don’t know the password, your only chance is to recover the password using a brute force attack. This wikiHow teaches you how to use the free Windows command prompt tool cRARk to determine the password of an encrypted RAR file.
Steps
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Download cRARk for Windows. You can download the latest free version at https://www.crark.net/#download. cRARk is a command line program that can crack RAR passwords using a brute force attack. As long as the file’s password is less than 6 characters long, you should have a good chance of successfully cracking using cRARk. [2] X Research Source
- If the password is more than 6 characters long but you do not have any information about the password, this process cannot be performed due to the extremely high encryption capacity of the RAR file.
- If you know a few characters in your password, you can crack with cRARk for passwords up to 28 characters in length. When using brute force attacks, knowing some password information will save you a lot of time.
- cRARk supports graphics processing unit (GPU) password recovery using CUDA and OpenCL technology, and can work with NVIDIA and AMD GPUs. If you don’t have a high-end graphics processor, the password identification process will take longer.
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Extract files from the RAR package. You need to use WinRAR or a regular RAR program to do this. Just right click on the file and select Extract here to extract the files inside.
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Rename the language definition files to password.def . In the extracted folder there are many files with .def extension for different languages. Right-click your language, select Rename , type password.def and press Enter .
- If you are using Windows Vista or Windows 7 and have an NVIDIA graphics processor (eg GeForce), you also need to launch the driver-timeout.reg file located in the extracted folder. [3] X Research Sources After the file is launched, restart the computer. Since this process can disable certain features of the video card, the article will show you how to undo the action after successfully cracking the password.
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Open the password.def file in Notepad. To proceed, simply right-click the file, select Open with , and then select Notepad .
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Edit the password definition file. Now you need to make some changes below the hash signs ## so that cRARk knows the rules for determining passwords. Note: only make changes to the part below those two pound signs.
- All lines starting with a pound sign # are comments. The only non-comment line is $a * . This means that cRARk will perform a brute force method to detect passwords that only use lowercase letters.
- More examples also appear in the file, which includes the option to find passwords that contain only numbers or a combination of letters and numbers. To use any of those options, remove the pound sign at the beginning of the line to uncomment.
- The last two options are for the case if you know part of the password. For example, if you know that a password starts with specific characters and ends with 4 numbers, uncomment the line MyPass $1 $1 $1 $1 and edit it to fit your criteria.
- To learn more about the different options in the password definition file, you can visit https://www.crark.net/cRARk.html#41.
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Save the changes. Click the File menu and select Save when finished editing to save the new password rules.
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Move the RAR file you want to jailbreak to the cRARk folder. This step is so that you don’t have to type long and complicated paths at the command prompt. Proceed to drag the file and drop it into the extracted folder to move.
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Open a command prompt to extract the cRARk folder by:
- First, copy the full path to the extracted folder at the top of the File Explorer window. To proceed, you need to highlight the entire path and press Contrp + C to copy.
- In the Windows Search search bar, type cmd and click the Command prompt that appears in the search results.
- Type cd and press spacebar .
- Press Command + V to paste the copied URL and then press Enter .
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Type crack yourarchivename.rar and press ↵ Enter to crack the password. Remember to replace yourarchivename.rar with the name of the RAR file you want to jailbreak. The password cracking process will begin based on the definitions you specified. After successful jailbreak, the password will appear after the line CRC OK . [4] X Research Sources
- A short and simple password will only take a few minutes, but the process can take days, weeks, months, even longer with complex passwords.
- To stop the process, you can press Contrp + C at the command prompt. If the jailbreak process still doesn’t stop, just close the Command Prompt window.
- On Windows 7 or Vista with the driver-timeout.reg file already launched, you’ll probably want to undo the action after you’ve finished using the tool. Once there, right click on the file, select Open with > Notepad , change dword:00000000 to dword:00000001 and save the file. Then double-click the file to launch it again and then restart the PC.
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This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 1,119 times.
When password protected, the RAR file is encrypted with one of the strongest security levels, AES 256 or AES 128 (depending on version). [1] X Trusted Source Library of Congress Go to Source If you can’t open the RAR file because you don’t know the password, your only chance is to recover the password using a brute force attack. This wikiHow teaches you how to use the free Windows command prompt tool cRARk to determine the password of an encrypted RAR file.
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