PCSTATS Main Page Follow PCSTATS on Facebook PCSTATS RSS Feed PCSTATS Twitter Feed + Motherboards
+ Videocards
+ Memory
+ Beginners Guides
News & Advanced Search  Feedback?
[X]   Directory of
Guides & Reviews

Beginners Guides
Weekly Newsletter
Archived Newsletters

+70 MORE Beginner GUIDES....  
 
Contact the Suite 66 Advertising Agency
Seagate Backup Plus Slim External USB 3.0 2TB Hard Drive Review

Beginners Guides: Decrypting Document & File Passwords

Beginners Guides: Decrypting Document & File Passwords - PCSTATS
Abstract: As PCSTATS illustrates in this article, a lot of the methods of protection used by common software packages are far from invulnerable.
Filed under: Beginners Guides Published:  Author: 
External Mfg. Website: PCSTATS Feb 19 2007   Mike Dowler  
Home > Reviews > Beginners Guides > PCSTATS

Recovering Passwords to Adobe PDF files

Like word documents, .PDF files created by Adobe's Acrobat software can be protected by two different levels of passwords. A 'user' password prevents anyone from opening the file unless they provide the correct identification, while an 'owner' password allows reading but prevents various forms of modification unless the correct password is entered.

Both of these forms of protection are susceptible to dictionary and brute-force attacks, as are most other programs that offer password protection. PDF files protected by older versions of Acrobat are also vulnerable to key searches, in which each possible numerical key (generated from the password to encrypt and decrypt the document) is tried.

Newer versions include support for encryption up to 128-bits, making this kind of password recovery impractical due to the amount of time it would take. Many products can instantly remove 'owner' passwords as long as the PDF document is unprotected by a 'user' password.

There do not appear to be any freeware or open source .PDF password recovery programs easily available as of now. Several companies offer professional password defeating and recovery software products targeted at PDF files.

Here are a few examples which have trial versions available:

Elcomsoft's Advanced PDF password Recovery Pro

Lostpassword.com's Acrobat key

AdultPDF.com's PDF password remover

The GuaPDF program, like GuaWord, strips password protection from PDF documents by using a key search. Useful if the password is too complex to be revealed with a brute-force attack program. It also strips 'owner' password automatically.

A word about securing documents

If you are concerned about the safety of data that you have password protected, the best step you can take is to enforce complex passwords. While a password like 'sesame' can be broken a few minutes or less by most modern password recovery programs, something more complex like 'SeSam3E$eed' will take a prohibitive amount of time for any program to crack.

Note the inherent weakness of the security features of older versions of Microsoft Office and Adobe Acrobat to 'key-search' attacks. If you are using these programs and want to make sure your data is safe, strong passwords will not suffice.

It is also possible to use some of the third party encryption programs we list a little later in this article. Microsoft Office XP contains enhanced security features which make cracking the password by key-searching (matching the numerical key used to create the encryption) practically impossible. Please keep in mind that there is a balance here. The harder you make your passwords, the harder it will be to recover from a forgotten password. Professional services are available, but there is a limit to what they can do with a well-designed password backed up by solid encryption.

If you want to make sure that your documents are protected from other methods of password cracking, like key-searches, there are a couple of ways to do this. If you are using Microsoft's Office XP, Word and Excel documents can take advantage of XP's increased security features. These programs use 128-bit encryption, making the documents effectively impossible to crack by means of a key search except with a few super-computers.

< Previous Page © 2017 PCSTATS.com
Please respect the time and effort that went into creating each PCSTATS Beginners Guide, do not illegally copy. Thank you.
Next Page >

 

Contents of Article: PCSTATS
 Pg 1.  Beginners Guides: Decrypting Document & File Passwords
 Pg 2.  Recovering Passwords to Word, Excel and Office files
 Pg 3.  Guaword and Cracking ZIP File Passwords
 Pg 4.  — Recovering Passwords to Adobe PDF files
 Pg 5.  Protecting documents with 3rdparty encryption
 Pg 6.  Using ABI-Coder to Encrypt
 Pg 7.  Restoration Deleted File Recovery

SEARCH PCSTATS 
Use the power of Google to search all of PCSTATS and the PCSTATS Forums. Tell us what you think of this new feature - FEEDBACK?
   11 / 19 / 2017 | 8:59PM
Hardware Sections 


google
 
PCSTATS Network Features Information About Us Contact
FrostyTech
TransmetaZone
BeginnersPC
PCSTATS Newsletter
PCSTATS Forums
ShoppingList Assistance
Tech Glossary
Technology WebSite Listings
PermaLink News
Archived News
Submit News (Review RSS Feed)
Site Map
PCstats Wallpaper
About Us
Employment
Privacy Policy
Advertise on PCSTATS

How's Our Driving?
© Copyright 1999-2017 www.pcstats.com All rights reserved. Privacy policy and Terms of Use.