fcrackzip – password cracker for zip archives

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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.

It can also crack cpmask'ed images.

Install fcrackzip in ubuntu

sudo apt-get install fcrackzip

This will complete the installation

fcrackzip 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...

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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11 Responses

  1. dado says:

    There is another way to extract a files form a password protected zip archive rather than crack a password. Let’s say we created a directory /tmp/test and put some files in it. I put /bin/bash, /bin/bunzip2, /bin/bzcat. Then we create a archive file like this: zip archive /tmp/test/* -e . Now files cannot be extracted without a password but it is possible to do this.
    To view contest of archive do unzip -l archive.zip. To extract a file from it do:
    unzip archive tmp/test/bash | cat /tmp/test/bash > bash

  2. Ramesh says:

    hi Dado,

    I tried with your advise but the problem is that the file name inside password-protected zip file is in this order
    file 1.jpg. The main problem is that there is space between file (filename) and number(i.e. 1 in this case). So I tried using wild characters like ? or * but did not work. Do you have any idea?

  3. Dado says:

    It should work with unzip archive *.jpg | cat *.jpg > test.jpg

  4. Tizdisturbed says:

    Hi Dado,

    I guess i don’t understand where i go to give the command to unzip the archive…help?

  5. lex says:

    Try copying it to home directory then type in terminal fcrackzip -c a -p aaaaaa ~/Sample.zip (number of a stans for number of char.)… hope this helped

  6. surendra says:


  7. Girish says:

    I used this utility but still not able to get the password

    fcrackzip -v -b -p aaaa -u data.zip

  8. Matt says:

    Hey, how do I do something like this in windows? I’ve tried downloading a number of password cracking programs but many require a license which I dont wanna pay for.
    any suggestions?

  9. any says:

    Zip file is sometimes called an “archive” file. The Zip file itself is really just a container..

    You can use some tool to recovery it.

    like ZIP Password recovery 5.0 is an easy and effective utility, designed to recover lost or forgotten passwords for ZIP/PKZip/WinZip archives.

  10. Kodekamel says:

    This isn’t trying “EVERY” combination? It’s skipping over the password that’s set on the file.

    Any ideas?

  11. Raul says:

    how to crack the password if we do not remember the length of the password? Pls help.

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