In a few article we also know the PDF file have two group Password, that’s Owner Password, another group called the User Password, because Owner Password is used to control permissions, in the article, we call it the authority Password; And User Password is used to open a file, so it is called the open Password.

I think a lot of people always think what if he design the software when learning a technology by himself. for example, for the declassification of PDF files, I will want to say that the file content is encrypted, so there must be a key to decrypt the content of the document. And this must require the input password is related to the Password. So what relation between this?

How to Hack PDF Password

Here always are some situations that we need to copy text from PDF files, so that we can use the extracted PDF text in other purpose. But do you know how to extract text from PDF? As we all known that some PDF files has password to protect the file being copying, editing and printing. So in this article, to hack the PDF Password: user Password and owner Password, PDF Password remover can remove restrictions from encrypted PDF files instantly and it is standalone software that means no Adobe Reader needed.

Password security is a system of basic safety factor, if the HASH value will be stored in the database, and may be cracked. I think, more security password storage is MD5 (user name + user password + random number), the HASH value not only can't reverse cracked, and cannot be replaced; it can resolve perfectly this question of readers.  As we all known that password is an effective way to protect the PDF files from coping, editing and printing. However, sometimes we have to change the PDF contents but we forgot the password of the PDF document. What can we do in this occasion? Obviously, we have to crack PDF password firstly before we can extract text from PDF files.

PDF encryption algorithm improved

PDF content of encryption algorithm began to support from PDF1.6 to AES encryption algorithm, block size for 16 bytes of CBC mode, the characteristics of the algorithm is to generate a random string as the initial encryption vector, the content of the encryption is back to the early, vector and therefore said even you know the part of the content files, also can't through the methods to solve three key PDF file.

If a PDF file without limiting for copying, editing, printing, we recommend convert PDF to ePub to copy PDF text. The best software not only convert PDF to text format support, but also support convert PDF to words and image format.

This artilce introduced in detail the validation process of PDF Password, and at the same time simply introduced the possible way of cracking encryption PDF files, of course, we discuss the purpose of the method is not hope you to design a software to break PDF Password ,Just trying to make you understand the PDF file decryption process, if you really do a software can be removed open the password of words, so maybe you can help similar to "visible" friends, never to forget the set up your password and can't open PDF file.

About Author:

Author works as a program developer in the USA, he love to IT industry, especially for the software safety, so he has been spent most of his time to develop the free software to help people,  PDF converter mac will be released soon.