How to Download and Use Fcrackzip: A Fast Zip Password Cracker
If you have ever forgotten the password of a zip file or need to crack one for ethical hacking purposes, you might be interested in fcrackzip, a fast and free zip password cracker. In this article, we will show you how to download and use fcrackzip on Windows and Linux systems.
What is Fcrackzip?
Fcrackzip is a tool that can crack password-protected zip files with brute force or dictionary-based attacks. It can also crack cpmask'ed images, which are zip files with scrambled names. Fcrackzip is partly written in assembler, which makes it very fast and efficient. It can optionally test the cracked passwords with unzip to weed out false positives.
Fcrackzip is useful for pentesters, ethical hackers and forensics experts who need to access encrypted zip files. It can handle multiple zip files at once and supports various encryption methods, such as ZipCrypto and AES.
Fcrackzip is available for both Windows and Linux platforms. You can download the binary files or the source code from the official website or from GitHub. Alternatively, you can install fcrackzip from your package manager if you are using a Linux distribution that supports it. For example, on Kali Linux, you can install fcrackzip with the command:
sudo apt install fcrackzip
How to Use Fcrackzip?
Fcrackzip has a simple command-line interface that accepts various options and arguments. You can view the help message with the -h option:
The basic syntax of fcrackzip is:
fcrackzip [options] file...
where file... are the zip files to crack. You need to specify at least one of the following options:
-b or --brute-force: use brute force algorithm
-D or --dictionary: use a dictionary
You can also customize the charset, the password length range, the method number, and the modulo value for the cracking process. For example, to crack a zip file with a brute force attack using lowercase letters and a password length of 6, you can use:
fcrackzip -b -c a -l 6-6 file.zip
To crack a zip file with a dictionary attack using a wordlist file, you can use:
fcrackzip -D -p wordlist.txt file.zip
To speed up the cracking process and reduce false positives, you can use the -u or --use-unzip option, which will test each password with unzip before reporting it.
Fcrackzip will display the possible passwords and their scores for each zip file. You can try them out manually or use fcrackzipinfo, a tool that comes with fcrackzip, to display information about the zip files.
Fcrackzip is a fast and free zip password cracker that can help you recover lost passwords or access encrypted zip files for ethical hacking purposes. It supports both brute force and dictionary attacks and can handle multiple zip files at once. You can download and use fcrackzip on Windows and Linux systems with ease. 06063cd7f5