So after you do that, move both your zip files, the encrypted one and the plaintext zip, into the pkcrack folder. Remember that file we needed to have? What you are going to do with it is you are going to compress it using the same compression method as the protected file. However, there’s still something we need to do before we can start the cracking process. Like this: cd desktop/pkcrack-1.2.2-win32 (this is the name for my folder) First open Command Prompt and go to your pkcrack location. Move your folder to your Desktop (you don’t have to, but we will do so for the purpose of this guide). After the download you will be provided with the executables (the guide is for windows). It is available for both Unix and Windows. This will only be helpful when that zip contains lots of other stuff and you need to have only one of those files for the attack to work. The problem for this method is that you need to have one of the original files contained in the encrypted archive. I mean, “just a matter of minutes”? Really? You’re probably thinking, there should be a catch to this. What if there’s a simpler way which will get the job done in a matter of minutes? Well, there actually is. It will take you a long long time to get to the password. What if you don’t remember that password? Of course, you will try to brute-force it, but, damn, that’s a lot of combinations. Did you find an old zip file while browsing your documents? Does it contain important information? You try to extract it, but a window pops up asking for a password.
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