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PDF Password Recover was available as a giveaway on May 9, 2017!
We all had such situations when we had to deal with the password-protected PDF files which are of the great importance. Sometime we may forget the password of the PDF files. At this time, we need an efficient and neat software solution designed to remove or recover the password restrictions from protected PDF files. PDF Password Recover is the one that can instantly recover the password locking the documents.
Windows XP/ Vista/ /7 8/ 10; 128 MB or RAM; 50 MB of HDD space; .Net4.0 Framework and Above
11.6 MB
$19.90
According to the screenshots, it supports only English letters.
This is a very big minus. The World is full of languages, on which passwords can be typed. For example, from German: ü ö ä, in Spanish there is the letter Ñ, Greek, Turkish: Ç ç Ğ ğ Ö ö Ş ş.
In the given case, I exclude the Russian language (it does not count).
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Such paid programs should also be online.
Many do not is no possibility to buy a very powerful computer, there is no possibility to wait a whole month (after all, a person does not remember in which language he wrote the password in his native language or in English).
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Dimma, to provide an online server or farm of servers that could be used by subscribers to brute-force passwords on anything would likely result in SLOWER try rate than using your own dedicated PC since it could be shared by thousands of people grinding the whole process to a near halt! First things first, maximize the local processing capabilities of the local machine, include multi-core AND simultaneous GPU multicore processing. If you then want to rent/lease a server and dedicate it solely to your own brute forcing of a password then you might manage a slightly better speed.
Another optimization would be segmented brute forcing where different machines are dynamically allocated different passphrase search ranges and each machine subdivides their allotted passphrase ranges for each processing core to maximize possible processing available.
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Dimma, It is a good suggestion. We will prepare the online tool
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Dimma, it is true.
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I have used PDFKey Pro for five years. It has never failed to unlock a password-protected pdf file, leaving the original file intact and producing an _unlocked.pdf copy. For me it has been worth its $25 price.
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I did protect a PDF:
https://www.dropbox.com/s/72olbp07sw5ohh9/Protected-Short_FixingAFlatTire.pdf?dl=0
To find a user password it took 1 minute:
https://www.dropbox.com/s/rm7hmvqbiyxj4jo/KortWW.png?dl=0
The owner password will take much longer.
The the folder came a new file PdfPasswordStorage.txt with the found passwords
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This is just a glorified brute force password cracker. The limitations are your machine. The more complex the password, the longer it will take, including YEARS.
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from my point of view it would be better if this could load all the pdf files in a folder and pre-scan them to show which have ANY form of password protection... It's taking ages finding ANY pdf files that have any form of protection all, including downloaded utility bills, official terms and conditions etc, one file at a time!
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TK, wow, you suggestions are awesome. Thank you so much. We will update this application with your ideas!
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Its easy to create your own PDF with a password though. Why would you want to scan a folder to find password-ed ones?
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Chris Locke (CS Computer Services), why ? because I wanted to test it in a real life situation with a real password protected file. The program is not intended to play with files you just created...
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Aah, it sounded like you were struggling to test the program with a password-protected PDF and you couldn't find one.
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Why TWO buttons at the bottom of the user interface that pop ups [ Start decryption process ]?
Fist button says [ Remove PDF ] ( does this really just take a highlighted PDF file out of the list above ? )
The second says [ Decrypt ]
Also, rather than 'decrypt', please change to 'find password' or 'remove password'.
So, does this save a password-free file, or just tell you the password for you to try?
Then change to [ Find password(s) ].
Thanks.
.
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Peter Blaise, Thank you! Your suggestions are important for us to improve user experience.
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Does it work with accented letters like æ or β?
Man, the captcha makes me sick...
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papin, not from the selections shown in the program. There is no custom character input box that would allow accented letters or other odd characters that might still be legal password characters.
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papin, same here- the captcha is pain.
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> the captcha is pain
Stops the bots though. :-)
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I ran the program on a pdf, the password I know is 8 capital letters, after 3 hours nothing, I turned it off
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George James Ducas, theoretically, this application is capable of calculating the only and correct password. The most important thing I should boost is the speed of calculation.
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support@pdfpasswordrecover.com, I am running a new computer with i7 and 64 bit, you are right, needs a faster calculating approach, perhaps running several sequences simultaneously? i wish i could help, but it would help to be faster
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support@pdfpasswordrecover.com, may i suggest you optimise the decryption testing routines in processor specific assembly language, wheither CPU or GPU and try and engineer it so the code loops and data segment that is test decrypted should reside within the level 1 caches for as long as possible and if that fails then level 2 cache, do not code the grunt work using any .NET framework, use .NET for the GUI if you must but not for any number crunching!
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Installed in XP but refuses to run.
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XP-Man, Sorry for that. This application requires .Net Framework 4.0 or above right now. We will release a new version which supports Win XP soon. We will inform you if you are kind to leave your email address for us.
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If your password is one character, then there are 26 possible combinations. If your password is two characters, then there are 26x26 combinations - 676. This goes up exponentially, so for a ten character password, thats 26x26x26x26x26x26x26x26x26x26... 141,167,095,653,376 combinations. Yes, its going to take a while to test all those. Thats assuming you use just upper or lower case. If you used both, then its 52x52x52x52.... etc. With 15 'additional' symbols (£$%&, etc) thats 67x67x67x67x67.... etc. 1.822e+18 - so 1 with 18 zeroes. Thats gonna take a while.
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Chris Locke (CS Computer Services), Correct. This application will try all combinations of passwords and get the correct one.
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But can you resume from a point? If the program has been running for 3 weeks, then Windows 10 decides to reboot to install necessary updates, would you have to start at the beginning? That would be a pain...
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Unless your user password is 5 characters or less and has no special characters, brute force recovery will take forever on a typical user machine.
Owner password defeat is quite simple, as it doesn't even require guessing since the password mechanism is flawed, it is easily broken.
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Downloaded and tried to install twice and both times got the error message: "error reading setup initialzation file"
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Hi, Bill Rutan, Sorry for the inconvenience we bring to you. We have never encounter such issue when we are testing our application. Would you mind giving us more detailed information such as your system environment to our support team? You can send an e-mail to: support@pdfpasswordrecover.com
Best Regards!
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Bill Rutan, try downloading the file from the vendors site listed as "Homepage:" and using the registration information in the Readme.txt in the giveaway zip bundle.
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