Decrypting Documents and Zipped File Passwords
 

"If you want to make sure that only you and your compatriots can access certain documents, encrypting and password protecting said documents is the obvious way to go. This is fine, but what if you forget the password? You might as well have deleted your work, right? As we will endeavor to show in this article, a lot of the methods of protection used by common software packages far from invulnerable."

Beginners Guide