Hi I'm quite new to Aircrack-ng and I just have a quick question. Is there a possible way to determine the amount of digits a wifi password has?

In the example below the amount of digits is already known as 12 how would I determine this amount of digits in the case where I don't know the password.

crunch 12 12 abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 | aircrack-ng -w - -b xx:xx:xx:xx:xx:xx capture-03.cap

I am doing this to my own router/wifi password. I am testing how quick if at all or partly, I can crack my own WPA2-PSK password without a wordlist.file

Second question:

If I add !@#$%^&*() to the end of abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890

will those digits be included in the attack? Is there perhaps a better way?

I'm keen on using my gpu to speed up cracking the password.

Third question:

Lets say my wifi password is IL*veMyCat# Is there perhaps a way to determine certain digits of that password and output them into a file e.g Output.txt> IL-veMyCat- Where the missing digits are * and #

I have been able to use aircrack-ng successfully on Khali V2, any help, links, advice will be appreciated thanks.

  • 1
    I don't believe you can het the password size. Input is stretched in order to form a password. Commented Sep 6, 2016 at 7:15
  • If you can find out what vendor of the router is you can search up informations about the password requirements. That could help you determine the length of the router password.
    – JoakimE
    Commented Oct 6, 2016 at 8:37
  • It is hard to understand if you are asking questions about password length, charset used in password or digits/numbers that are used in the psk. Voting this question as "unclear". Commented Nov 5, 2016 at 9:43
  • Generally, it might be easier to split these three actual questions into three separate stackexchange questions. Commented Dec 5, 2016 at 9:34

1 Answer 1


It is not possible to determine either the length or certain characters of the password. You can read more about the authentication protocol here to understand why: https://en.wikipedia.org/wiki/IEEE_802.11i-2004.

For your second question, yes, they will be included in the attack. You can check the manual of crunch to see examples of how it can be used by running: man crunch (I suppose you're using linux)

Your password is pretty strong. I believe it will take forever for any moderate attacker to crack it.

  • Thanks I hope to do some more research on the topic. I might even answer myself, who knows :)
    – Jonas
    Commented Sep 7, 2016 at 14:02

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