Break WinRAR Password in ubuntu......

Once I downloaded an ebook which was in .RAR format. When i tried to extract the book it asked for password and unfortunately i was not having the password.
    
       Have you ever got in such type of trouble???? Well if yes then you are on the right place to get rid of this problem. This tutorial is for breaking RAR passwords.


 The tool which we will be using is Rarcrack. RarCrack is a program that uses brute force algorithm to find and recover the correct password for compressed archive in .rar (WinRAR), .7z (7-Zip) and .zip (WinZip) format in any POSIX compatible operating system. As such, RarCrack is useful when you have forgotten or lost the password for the compressed archive package in the supported format. To make bruteforce password breaking faster, RarCrack supports specifying a selection of characters and digits to be used in password generations in order to crack the password.

you can download Rarcrack from any of the mirrors, just type in terminal-----

wget http://superb-east.dl.sourceforge.net/sourceforge/rarcrack/rarcrack-0.2.tar.bz2
wget http://kent.dl.sourceforge.net/sourceforge/rarcrack/rarcrack-0.2.tar.bz2
wget http://nchc.dl.sourceforge.net/sourceforge/rarcrack/rarcrack-0.2.tar.bz2

Now extract the Rarcrack

tar -xjf rarcrack-0.2.tar.bz2

and now move to extracted Rarcrack directory i.e move to extracted Rarcrack folder

cd rarcrack-0.2

Finally install Rarcrack by typing--------

make

sudo make install

Now to use Rarcrack following is the syntax-----

rarcrack encrypted_archive.ext [--threads thread_num] [--type rar|zip|7z]

RarCrack can autodetect the archive type, so the –type parameter only require if auto-detection of file type is wrong