We frequently use zipped files due to its small size and strong encryption algorithm. These zipped files comes with a facility of password protection which maintains the security of the files.
But sometimes this security feature turns into a drawback if we somehow forget the password. In that case the password cracker play their role. You can also use them if you downloaded a zipped file with password protection on it.
In my last article, if you followed then we learned to make a bootable USB of backtrack. So here I'm gonna introduce a tool which is present in Backtrack and if you have no past experience with Linux then no issues you can start from here. The open source tool we are gonna use is called fcrackzip.
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.
-b brute force
-D dictionary Attack
-c charset characterset
-p init-password string
-l length min-max
-m method num
-2 modulo r/m
-b > bruteforce
-c a > charset lower case alphabets
-l 1-6 > length of expected password