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RECOVER PDF PASSWORD 128 BIT CRACKED

We can confirm this with QPDF:Ĭonclusion: PDFs protected with a 4 character user password using 40-bit encryption can be cracked in a couple of seconds using free, open-source tools.įYI, I used the following GPU: GeForce GTX 980M, 2048/8192 MB allocatable, 12MCU

-i : this incremental option makes that the set of generated password is not only 6 characters long, but also 1, 2, 3, 4 and 5 characters long.

?a?a?a?a?a?a : I’m providing a mask for 6 alphanumeric characters (I want to brute-force passwords up to 6 alphanumeric characters, I’m assuming when John mentions a short password, it’s not longer than 6 characters).

-a 3 : I perform a brute force attack (since it’s a random password).

-m 10400 : this hash mode is suitable to crack the password used for 40-bit PDF encryption.

–potfile-path=encryption_test.pot : I prefer using a dedicated pot file, but this is optional.

This is the command I’m using: hashcat-4.0.0\hashcat64.exe -potfile-path=encryption_test.pot -m 10400 -a 3 -i "encryption_test - CONFIDENTIAL.hash" ?a?a?a?a?a?a I’m storing the output in file “encryption_test – CONFIDENTIAL.hash”.Īnd now we can finally use hashcat. Let’s extract field 2 (you can use awk instead of csv-cut.py): For hashcat, just the hash is needed (field 2), and no other fields. This format is suitable for John the Ripper, but not for hashcat.

However, I use a patched version of pdf2john.py that properly handles default 40-bit keys. For example, it would not properly generate a hash for 40-bit keys when the /Length name was not specified (like is the case here). Remark that John the Ripper (Jumbo version) is now using (a Perl program), because there were some issues with the Python program (pdf2john.py). I’ve written some blog posts about decrypting PDFs, but because we need to perform a brute-force attack here (it’s a short random password), this time I’m going to use hashcat to crack the password.įirst we need to extract the hash to crack from the PDF. This output (invalid password) tells us the PDF document is encrypted with a user password. QPDF can be used to determine if the PDF is protected with a user password or an owner password: PDFs encrypted with a owner password can be opened without providing a password, but some restrictions will apply (for example, printing could be disabled). PDFs encrypted with a user password can only be opened by providing this password. PDFs can be encrypted for confidentiality (requiring a so-called user password /U) or for DRM (using a so-called owner password /O). This encryption method uses a 40-bit key (usually indicated by a dictionary entry: /Length 40, but this is missing here). Pdfid.py confirms the PDF is encrypted (name /Encrypt):įrom this I can conclude that the standard encryption filter was used. So first, let’s check out how the PDF is encrypted. Here is how I decrypted the “easy” PDF (encryption_test).įrom John’s blog post, I know the password is random and short.

RECOVER PDF PASSWORD 128 BIT RAR

It is also important that the source file is not modified in any way because the RAR recovery program can only read data from it.In this series of blog posts, I’ll explain how I decrypted the encrypted PDFs shared by John August (John wanted to know how easy it is to crack encrypted PDFs, and started a challenge).

The extracted records and folders will save to the specified location to used later.

The title or file body has partially corrupted.

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Used any unknown method in the archive name.The package data in the volume name failed.Recovers if the title of the file is corrupted.It works rapidly on damaged rar files or hidden formatted rar files.

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RAR Recovery Toolbox restore you recovered data on your default location on hard drive. It depends on the degree of damage to the archive file data. Otherwise, it may not be able to recover some data. Please note that the recovery toolbox RAR may not properly restore some files. You can view this list and select only the objects you want to save. Recovery Toolbox for RAR Displays the final list of files and folders on the screen. It scans and parses the corrupted archive and extracts all the information that can draw from the WinRAR file. Moreover, it works perfectly in following situations.

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