1. Crack Password Using JohnTheRipper Tool. Firstly, we are going to install John the ripper tool in your Kali by typing sudo apt-get install john in your terminal and if you are using another platform like windows then you can download it via clicking here.
2. It is a GUI frontend for password cracking and brute force attack tool which can be used for wide range of situation, including authentication based. This hacking tool was introduced by Van Hauser from The Hacker’s Choice and David Maciejak. It uses a dictionary attack or brute force methods to test for simple or weak passwords.

John the Ripper is designed to be both feature-rich and fast. It combines several cracking modes in one program and is fully configurable for your particular needs (you can even define a custom cracking mode using the built-in compiler supporting a subset of C).

Crack Zip Password Using Kali Linux

fcrackzip is a tool used to identify passwords of zip file. This tool works on simple concept of bruteforce.

You can install fcrackzip by following simple steps:

Verify installation

Example Usage

Here

-u : use unzip file to identify passwords

-D : use a dictionary

Crack Password Protected Zip Kali Linux

-p : input password

Here

-b : brute force option

-l : check password with minimum and max length

-v : verbose

Conclusion

This is short tutorial to explain installation and simple usage of fcrackzip on Kali Linux.

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If you have any questions, feel free to ask in the comments section below. Nothing gives me greater joy than helping my readers!

Disclaimer: This tutorial is for educational purpose only. Individual is solely responsible for any illegal act.

If you want to crack zip file passwords use fcrackzip.fcrackzip is a fast password cracker partly written in assembler. It is able to crack password protected zip files with brute force or dictionary based attacks, optionally testing with unzip its results.

Install fcrackzip in Ubuntu

sudo aptitude install fcrackzip

This will complete the installation.

Fcrack Syntax

fcrackzip [-bDBchVvplum2] [--brute-force] [--dictionary] [--benchmark] [--charset characterset] [--help] [--validate] [--verbose] [--init-password string/path] [--length min-max] [--use-unzip] [--method name] [--modulo r/m] file.

fcrack Options

-h, –help
Prints the version number and (hopefully) some helpful insights.
-v, –verbose
Each -v makes the program more verbose.
-b, –brute-force
Select brute force mode. This tries all possible combinations of the letters you specify.
-D, –dictionary
Select dictionary mode. In this mode, fcrackzip will read passwords from a file, which must contain one password per line and should be alphabetically sorted (e.g. using (1)).
-c, –charset characterset-specification
Select the characters to use in brute-force cracking. Must be one of

a include all lowercase characters [a-z]
A include all uppercase characters [A-Z]
1 include the digits [0-9]
! include [!:$%&/()=?[]+*~#]
: the following characters upto the end of the spe-
cification string are included in the character set.
This way you can include any character except binary
null (at least under unix).

For example, a1:$% selects lowercase characters, digits and the dollar and percent signs.

-p, –init-password string
Set initial (starting) password for brute-force searching to string, or use the file with the name string to supply passwords for dictionary searching.
-l, –length min[-max]
Use an initial password of length min, and check all passwords upto passwords of length max (including). You can omit the max parameter.
-u, –use-unzip
Try to decompress the first file by calling unzip with the guessed password. This weeds out false positives when not enough files have been given.
-m, –method name
Use method number “name” instead of the default cracking method. The switch –help will print a list of available methods. Use –benchmark to see which method does perform best on your machine. The name can also be the number of the method to use.
-2, –modulo r/m
Calculate only r/m of the password. Not yet supported.
-B, –benchmark
Make a small benchmark, the output is nearly meaningless.
-V, –validate
Make some basic checks wether the cracker works.

fcrackzip Examples

fcrackzip -c a -p aaaaaa sample.zip

checks the encrypted files in sample.zip for all lowercase 6 character passwords (aaaaaa … abaaba … ghfgrg … zzzzzz).

fcrackzip --method cpmask --charset A --init AAAA test.ppm

checks the obscured image test.ppm for all four character passwords. -TP fcrackzip -D -p passwords.txt sample.zip check for every password listed in the file passwords.txt.

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