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30 July 2008

Cracking Zip Password Files

Tut On Cracking Zip Password Files..
What is FZC? FZC is a program that cracks zip files (zip is a method of compressing multiple files into one smaller file) that are password-protected (which means you're gonna need a password to open the zip file and extract files out of it). You can get it anywhere - just use a search engine such as altavista.com.
FZC uses multiple methods of cracking - bruteforce (guessing passwords systematically until the program gets it) or wordlist attacks (otherwise known as dictionary attacks. Instead of just guessing passwords systematically, the program takes passwords out of a "wordlist", which is a text file that contains possible passwords. You can get lots of wordlists at www.theargon.com.).
FZC can be used in order to achieve two different goals: you can either use it to recover a lost zip password which you used to remember but somehow forgot, or to crack zip passwords which you're not supposed to have. So like every tool, this one can be used for good and for evil.
The first thing I want to say is that reading this tutorial... is the easy way to learn how to use this program, but after reading this part of how to use the FZC you should go and check the texts that come with that program and read them all. You are also going to see the phrase "check name.txt" often in this text. These files should be in FZC's directory. They contain more information about FZC.
FZC is a good password recovery tool, because it's very fast and also support resuming so you don't have to keep the computer turned on until you get the password, like it used to be some years ago with older cracking programs. You would probably always get the password unless the password is longer than 32 chars (a char is a character, which can be anything - a number, a lowercase or undercase letter or a symbol such as ! or &) because 32 chars is the maximum value that FZC will accept, but it doesn't really matter, because in order to bruteforce a password with 32 chars you'll need to be at least immortal..heehhe.. to see the time that FZC takes with bruteforce just open the Bforce.txt file, which contains such information.
FZC supports brute-force attacks, as well as wordlist attacks. While brute-force attacks don't require you to have anything, wordlist attacks require you to have wordlists, which you can get from www.theargon.com. There are wordlists in various languages, various topics or just miscellaneous wordlists. The bigger the wordlist is, the more chances you have to crack the password.

Now that you have a good wordlist, just get FZC working on the locked zip file, grab a drink, lie down and wait... and wait... and wait...and have good thoughts like "In wordlist mode I'm gonna get the password in minutes" or something like this... you start doing all this and remember "Hey this guy started with all this bullshit and didn't say how I can start a wordlist attack!..." So please wait just a little more, read this tutorial 'till the end and you can do all this "bullshit".

We need to keep in mind that are some people might choose some really weird passwords (for example: 'e8t7@$^%*gfh), which are harder to crack and are certainly impossible to crack (unless you have some weird wordlist). If you have a bad luck and you got such a file, having a 200MB list won't help you anymore. Instead, you'll have to use a different type of attack. If you are a person that gives up at the first sign of failure, stop being like that or you won't get anywhere. What you need to do in such a situation is to put aside your sweet xxx MB's list and start using the Brute Force attack.
If you have some sort of a really fast and new computer and you're afraid that you won't be able to use your computer's power to the fullest because the zip cracker doesn't support this kind of technology, it's your lucky day! FZC has multiple settings for all sorts of hardware, and will automatically select the best method.

Now that we've gone through all the theoretical stuff, let's get to the actual commands.



3 comments:

Alex said...

Once I had problem,and myself helped this tool-damaged zip file,which myself advised my good friends,they had enjoyed for it,utility has free status as far as I know,and also program recovers information from damaged zip files and minimizes data loss during the zip recovery process,use of multiple algorithms allows the program to minimize data loss during zip recovery, therefore the user sees as much as possible about the files being recovered,will have to enter the password when prompted and the application will make a fix zip file attempt using the specified password,program supports Windows 98, Windows Me, Windows NT 4.0, Windows 2000, Windows XP, Windows XP SP2, Windows 2003 and Windows Vista,solve problem with fix the Cannot open file: it does not appear to be a valid archive in ZIP archive error.

Alex said...

Often loss of information occurs on next reasons:viruses,hackers and system errors,to my mind in similar situation there is way-check zip file integrity,tool helped myself and friends not once,has free status as far as I can see,it permits to repair corrupted archives with *.zip extension,solve errors on example-CRC error and Cannot open file: it does not appear to be a valid archive,program for check repair zip file and check integrity of zip file uses several different algorithms for crc check fix zip file and data recovery, that is why, the process will take some time, according to CPU performance and file size,program will work under all supported versions of this operating system,will keep initial structure of your archive as well as original names of files and directories,check repair zip file can check why zip file is corrupted and work with password protected archives, but you should know this password.

Alexis said...

Some days ago was the situation...I lost my passwords for zip files.But in net I saw-fix winzip corrupt,and tried it...Tool solved this problem in a minute without payment.Moreover it showed recovery algorithms of fix valid archive error winzip, that are used simultaneously.

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