11/07/2006 Utilities

What is PDF?

Short for Portable Document Format, a file format developed by Adobe Systems. PDF captures formatting information from a variety of desktop publishing applications, making it possible to send formatted documents and have them appear on the recipient's monitor or printer as they were intended.

About PDF Password Cracker Pro

PDF Password Cracker Professional edition allows to search for "owner" and "user" passwords with brute-force and dictionary attacks, effectively optimized for speed (however, don't expect to recover long passwords in a reasonable time with these attacks). In addition, it has Key search attack, which guarantees the decryption (regardless the password length and complexity) of PDF files that use 40-bit encryption (the attack takes about 3-4 days on fast CPU systems).

How to Crack PDF Password?

1.Download PDF Password Cracker Professional and install it.

2. Open the PDF Password Cracker Pro program by either going to Programs, select PDF Password Cracker Pro v2.0 and click PDF Password Cracker Pro v2.0. The interface below will display.



3. Click the "Load" button to locate the file which you would like to remove the passwords, then click the "Open" button.



4. Click the "Decrypt" button or "Start" button, then PDF Password Cracker Pro will test the passwords for your PDF file automatically.

5. Once PDF Password Cracker Pro retrieved the user password, it will popup a Save As dialog, you may save to a normal PDF file directly, all restrictions will be removed from this decrypted PDF file.

Type of attack:

• Brute-force: Brute force attack for PDF file.
• Dictionary: Construct user password from a dictionary file.
• Key search: Search file key for a 40-bit encryption PDF file, the key length is 40 bits, so the total number of keys is 2^40, or 1,099,511,627,776, the whole recovery process takes about 30 days on PIII-450 computer, and the average is just 15 days.

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