GuaPDF
Guaranteed PDF Decryptor/Restrictions Remover
Purpose
This is an utility to bypass the security on PDF documents (of course, you should have the right to do it, for example, in case of forgotten user/owner password). Both protection methods are cracked:- password encrypted file can be decrypted (in a several days or weeks);
- restricted operations on file can be disabled (instantly).
PDF security overview
The standard security provided by PDF consist of two different methods and two different passwords. A PDF document may be protected by password for opening ('user' password) and the document may also specify operations that should be restricted even when the document is decrypted: printing; copying text and graphics out of the document; modifying the document; and adding or modifying text notes and AcroForm fields (using 'owner' password). An example of restricted file you can find on Kyler Laird's page and here is the same file processed by GuaPDF. An example of encrypted file you'll find in the GuaPDF distribution archive.Method to decrypt files with password for opening
Most password crackers are trying to determine right password by testing passwords (using brute-force or dictionary attacks). This method is good only for short and non-complex passwords. For example, the average program gives about 100.000 - 300.000 password/second on Pentium II/333. To find 8-character password consisting of lowercase Latin letters and digits you'll need about 200 days. But what if password is longer or consists of special characters or national symbols?(Un)fortunately, another method to decrypt PDF files exists. PDF security scheme uses strong enough encryption algorithm, but because of U.S. crypto export regulations the key length is only 40 bits. So, you need to test only 240 keys to decrypt your file with guarantee. GuaPDF does it, and key testing will take about 45 days on the same Pentium II/333 PC. Within this time (and in average within the half of this time) ANY file, encrypted with ANY password (no matter what length of the password is or what language or symbols used, etc) can be decrypted.
Moreover, GuaPDF offers distributed computing mechanism (via the shared directory) and you should divide the necessary time to the quantity of PCs you've got.
Some companies offer PDF guaranteed cracking service. The average price for decrypting ONE file is about $500 and it takes 10 business days. This offer may be preferable to you if you've got neither time nor powerful computer(s).
Advantages of GuaPDF are:
- Guarantee of decryption
- Very high speed (optimized for Pentium II architecture)
- Confidentiality (you crack your secret files, not someone from cracking service)
- Price
Versions and price
There are some GuaPDF versions:- DEMO (freeware) version. It demonstrates processing of both security methods but has some limitations and can correctly decrypt only small files. It also doesn't contain distributed computing mechanism.
- RESTRICTIONS REMOVER. This version can only unset operation restrictions (i.e. remove owner password) and can not decrypt password-protected files. ($29)
- n-CLIENTS. These versions process both security methods (i.e. user and owner passwords), have distributed computing mechanism but number of distributed clients are limited. (from $79)
- UNLIMITED , most powerful version. It does everything, has no limitations. ($690)
| Restrictions (or owner password) removal | Key searching | Decryption using found key (user password removal) | Distributed mechanism | Licence | Average time to decrypt | Price | |
| Demo | YES (only small files) | YES | YES (only small files) | NO (only 1 computer) | Freely distributable | 3 weeks | FREE |
| Restrictions remover | YES | - | - | - | Non - commercial | - | $29 |
| 5-clients | YES | YES | YES | YES, 5 clients max. | Non - commercial | 5 days (on 5 clients) | $79 |
| 10-clients | YES | YES | YES | YES, 10 clients max. | Non - commercial | 2 days (on 10 clients) | $149 |
| Unlimited | YES | YES | YES | YES, any number of clients | Any purposes (except distribution) | Depends of number of clients | $690 |
Order and download
GuaPDF v. 1.1 DEMO - download now!Order the commercial versions over the Internet worldwide using secure connection. This means your confidential information remains confidential. The fully functional version will be sent to you by e-mail (so, use your REAL account). Normally you'll get the program within 1-2 hours.
Order GuaPDF 1.1 commercial (restrictions remover)
Order GuaPDF 1.1 commercial (5, 10 & unlimited clients version)
ONLY if you already got restrictions remover version, you can upgrade to 5-clients version for $52.95.
You can make a payment in dollars or in euros. Visa, Mastercard/Eurocard, American Express and Diner's Club are accepted. Other payments options include check, cash or bank transfer. You can also register via fax or postal mail. These options will available for you by clicking on the link above.
Here you'll find more information about ordering process.
If you won't get the program within 24 hours after ordering, please contact me!
Support
Only legal customers are supported. No claims and question about freeware version will be accepted.Please send any comments and bugs to psw@ssl.stu.neva.ru. In case of the reported bug I'll update program as soon as possible.
Also contact me if you have any problems with ordering the program or if you are interested in Linux GuaPDF version.
Version history
1.1:
- /p option has been extended, now you can decrypt files with known onwer password instantly. Restrictions remover version hasn't been changed.
- key testing is 5% faster
- new options /p, /y
- fixed minor bugs in parsing and decrypting
- some interface improvement
- First (BETA) version released.
Look at the other password crackers
Back to main password cracking page
(c) This page created with Netscape Navigator Gold by P. Semjanov
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Last updated: 06.10.2000