Crunch Password list generation in Kali Linux

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In this tutorial we will be using the Crunch Password list generation tool in Kali Linux. Crunch is an easy to use tool for generating a custom made password list used for brute force password cracking. Crunch comes as a standard tool in Kali Linux. This tutorial shows you how easy it is to generate a password list containing all combinations of 4 letters, 5 letters and a password list containing 5 letters followed by a year. You can also use Crunch to generate password lists based on default router passwords as demonstrated in a few other tutorials. UPC Broadband routers use 8 capital letters as default password for Wifi and TP Link routers use the 8 digit default WPS PIN. Both can be easily generated with Crunch.

Crunch password list generation

Let’s use the following command to have Crunch generate a wordlist containing all combinations of 4 letters:

crunch 4 4 ABCDEFGHIJKLMNOPQRSTUVWXYZ -o /root/Desktop/wordlist.txt

The generated Crunch password list has a size of 2 MB

Crunch Password List generation

Let’s use the following command to have Crunch generate a wordlist containing all combinations of 5 letters:

crunch 5 5 ABCDEFGHIJKLMNOPQRSTUVWXYZ -o /root/Desktop/wordlist.txt

The generated Crunch password list has a size of only 67 MB

The next wordlist we are going to make is a wordlist containing all possible combinations with 5 letters follow by 1980. The 1980 represents a year of birth for instance, commonly used as a password in combination with a name:

crunch 8 8 ABCDEFGHIJKLMNOPQRSTUVWXYZ
-t @@@@1980 -o /root/Desktop/wordlist.txt

The generated Crunch password list has a size of only 3 MB.

Crunch Password list Video Tutorial

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6 Comments

  1. Please help me create a wordlist containing all combinations of 12 digit passwords build of lower-case letters and numbers ONLY. How big is it going to be?

      • 12 lowercase alphanumeric = 5558 PB. yeah its tricky to make it right
        but you can always define first char as special char like @ or !, define 3-4 word inside and numbers at the end :P

      • how can i generate a list with a name and all possible birthdays in this pattern namedaymonthyear day/month/year two digits each ex: kali170893

  2. Krunal Bhakre on

    It does not accept the command and always says “No such file or directory”.!!
    What to doo with that issue??? Hoe to solve that ???
    Plz tell..

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