May 11, 2021

How to crack a long zip password?

Home Forums How to crack a long zip password?

This topic contains 1 reply, has 2 voices, and was last updated by  AfternoonPenalty 3 weeks, 3 days ago.

  • Author
  • #383930


    I have a password protected zipfile and a list of ~300 words, one of which is the password. The problem is that they’re all 50-70 characters long.

    I tried john which informed me that ‘Can’t set max length larger than 31 for PKZIP format’.

    I tried hashcat which crashed on me (segmentation fault, maybe an opencl issue, I have an integrated gpu)

    I tried fcrackzip which just failed without an explanation. Experimentally I discovered that it fails with passwords longer than 39.

    Are there any alternatives?

  • #383931


    I may have got this completely wrong but you have a list of 300 passwords and a zip with a password on?

    Could you not write a bash script or something to read in the list of passwords to an array and loop round that array using the next password until something gets unzipped?

    My bash is a bit cack, but something like:
    `passwordlist=($(cat /path/to/passwords.txt))`
    `for password in “${passwordlist[@]}”`
    `unzip -P $password` [``](

    You might need some exit code checking to know which password did it or to drop out on successful unzip.

  • #383932


    Shoot me a PM, I have a rig.

  • #383933


    Have you tried 7zip?

  • #383934


    I had good luck with Elcomsoft’s password tools in the past before setting up Hashtopolis. Haven’t used anything since. It’s paid software though.

You must be logged in to reply to this topic.