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PDF Password

 

Pdf Password v15.0.9217
released on 3/24/2011
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demo (2079 Kb)
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Pdf Password
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PDF Password recovers lost passwords to password-protected PDF files (*.pdf). PDF Password recovers user and permission passwords only. PDF Password does not allow to break DRM (Digital Right Management) system.

If user password (also known as password to open) is either not set or known, it is possible to remove permission password instantly. Unfortunately, if a user password is unknown, there is no easy way to recover the password to a PDF document. Universal recovery methods, such as Brute Force Attack and Dictionary Search, must be used. Unfortunately, due to a nature of an encryption method used in PDF files, the password search is very slow. The brute force speed is usually under one thousand passwords per second even on a top-speed modern PC. It means that long password recovery takes too long time. Use our Password Calculator to estimate your chance. Please read this article for more information on Universal Recovery Methods.

The recovery methods used by PDF Password (click to find more information on each method):

See also:

Guaranteed PDF Recovery

If a PDF file is protected with a 40-bit key, it can be decrypted within a reasonable time span regardless of the length of the password. The password protection will be removed, while the original password will remain unknown. Two methods are available for doing that:

1) Guaranteed Recovery (Brute-force attack on a 40-bit key). This method has a 100% success rate, but it takes a while to complete: a typical recovery on a quad core CPU takes about 2 days. The following recovery options are available when you choose this method:

Initial Key Value
Normally this value is set to zero and you should not adjust it. This value is used for continuing an interrupted search. If the recovery process is interrupted, on the next run this value will be automatically replaced with the last checked key, so the search will be resumed. Initial Key Value is a hexadecimal number in the range between 0000000000 and FFFFFFFFFF.

Distributed Recovery Settings: This Computer Index and Total Computers
Use these options if you want to use several computers to speed up the recovery process. Run PDF Password against the same PDF file on each computer, enter the number of computers (the same value for each instance) into the 'Total Computers' field and then enumerate the computers using the 'This Computer Index' (enter 1 in this field on the first computer, 2 - on the second one, and so forth). If you use just one computer, the default values (1 and 1) must be left unchanged.

2) The so-called Rainbow Tables Recovery. The main advantage of the method is speed; you can achieve the result within 1-3 minutes at the success rate over 99.7%. It is really close to 100%, but not 100%. This means that in rare cases this recovery method may fail. Another disadvantage of this method is the size of the table: you need to download and install a data table that takes several gigabytes.

 

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Important note. This is not a cracking or hacking site. We do not offer software "cracks", cracking programs or other hacking tools. Instead, we offer password recovery software and password recovery services. Password recovery software is also known as "password crackers" (or "password breakers"). Note that "password crackers" are not "software crackers". Software crackers are produced by hackers and are used to run illegal software copies. Password crackers are used to "crack" lost or forgotten passwords. Have you ever forgotten your password? We could help you... 

Sometimes people ask us why Demo versions of our software are so limited. Here is the answer. Password recovery tools are very special software. Unlike regular software, a typical password recovery tool may be needed only to restore that much needed document, and nothing more. You use it only once, as opposed to system-checking, workspace-improving or security software. Suppose we release a regular time-limited fully-functional trial version. In this case we will inevitably lose a lot of our customers ("one-time users"). Developing good password recovery software takes a lot of efforts from our professionals, so we simply wouldn't be able to stay in business if we gave our software away for free. We have to offer you software with limited capabilities so you can have a chance to evaluate them, and we have a chance to get paid for the full version and keep bringing you better products in the future. Your understanding is much appreciated; if you choose our products, you won't be disappointed by their performance and support!

If you have any suggestions or ideas on improving our software, please let us know. We do appreciate your opinion!

If you have any problem or question, feature request or inquiries, do not hesitate to contact us. Just send us email, and we'll get back to you as soon as possible. Also we really appreciate your comments and feedback.

PDF Password screen shot (click to enlarge)

PDF password recovery


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