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📁 Crunch

What is Crunch?

Crunch is a wordlist generator where you can specify a standard character set or any set of characters to be used in generating the wordlists. The wordlists are created through combination and permutation of a set of characters. You can determine the amount of characters and list size.

This program supports numbers and symbols, upper and lower case characters separately and Unicode.

Cheatsheet

-b: specifies the maximum size of the wordlist.
-c: specifies the number of lines to write to the wordlist.
-d: limits the number of duplicate characters
-e: stop generating words at a certain string
-f: specifies a list of character sets from the charset.lst file
-i: inverts the order of characters in the wordlist
-l: allows the literal interpretation of %,@^ when using -t
-o: specifies the output wordlist file
-p: prints permutations without repeating characters.
-q: Like the -p option but it reads the strings from a specified file
-r: resumes a previous session (cannot be used with -s)
-s: specifies a particular string to begin the wordlist with
-t: sets a specific pattern of @,%^
-z: compresses the output wordlist file, accompanied by -o
@represents lowercase letters
^represents special characters
% represents numbers
, represents uppercase letters

Example of usage

To create a word list of specific numbers. 

crunch 1 2 0123456789 > wordlist.txt

This command will generate a wordlist of 110 words having the one and 2 digit numbers with all combinations of digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. you could use alphabets

To generate a wordlist with a specific pattern. 

crunch 9 9 -t juve^%%%%

Here we have 4 characters to represent some group of characters which are as follows:

  • , for all uppercase letters
  • @ for all lowercase letters
  • % for all numeric characters
  • ^ for all special characters

{% file src="../../.gitbook/assets/crunch 9 9 -t juve^%%%%.webm" %}

So the above command will output all the words starting with “juve” and then after that a special character and then 4 digit number.

To generate a custom wordlist with letters, symbols and numbers.as

This Step is for Mixed with letters, Symbols, Numbers and creating a custom wordlist Run this command on Your terminal

crunch 4 8 123abcdefgh#$% -o list.txt

crunch <min> <max> <charset> -o <output in text file>

  • min : It is the minimum password length.
  • max : It is the maximum password length.
  • charset: Character se to be used.
  • -o : Output in a textfile. along with name of the text file.

To generate a wordlist with a permutation of some strings or characters 

crunch 1 10 -p juve 123

In the case of -p, the minimum size and the maximum size values are ignored by the crunch and it displays all the possible permutations.

The above command will give 2 permutations of “juve 123”.

Other References:

https://www.hackingarticles.in/a-detailed-guide-on-crunch/