eovnu87435ds Posted January 1, 2011 Share Posted January 1, 2011 Does anybody know of some tools that can be used to decrypt an encrypted Adobe PDF file? According to acrobat, the Security method is Document Open Password Security with 128-bit AES encryption. I could've sworn somewhere I read the BackTrack4 includes a tool that can help with this, but I can't find that article, nor do I have a BT4 iso at the very moment. If it helps, I have attached a sample file of what would need to be decrypted. The password for it is 2011DecryptTest. http://ge.tt/39GDd9C Quote Link to comment Share on other sites More sharing options...
Guest Deleted_Account Posted January 2, 2011 Share Posted January 2, 2011 If the password is weak/short enough you can just brute force it or use a dictionary attack. Like everything you want to attack it at it's weakest point. When it comes to encryption (especially standards like AES) the weakest point is the password (usually). Now if the password is too long 14+ chars. or and uses full ASCII characters like !@#lsa.?< then these attacks won't yield much success for a long time. I used to have a program that did this but a quick google search may find a free one. Quote Link to comment Share on other sites More sharing options...
eovnu87435ds Posted January 2, 2011 Author Share Posted January 2, 2011 If the password is weak/short enough you can just brute force it or use a dictionary attack. Like everything you want to attack it at it's weakest point. When it comes to encryption (especially standards like AES) the weakest point is the password (usually). Now if the password is too long 14+ chars. or and uses full ASCII characters like !@#lsa.?< then these attacks won't yield much success for a long time. I used to have a program that did this but a quick google search may find a free one. very true. now to assemble a cluster of 50 PS3's! Quote Link to comment Share on other sites More sharing options...
Guest Deleted_Account Posted January 3, 2011 Share Posted January 3, 2011 (edited) very true. now to assemble a cluster of 50 PS3's! Woot I'm in! Never updated mine so linux is still there!! :D Now let's crack us some encryption! EDIT: You could also hope that they didn't implement AES properly and see if there are anyways to recover the password. I think this is what happened with MS Office a while back where the password/keys could be recovered from the file because they used a weaker hash. Edited January 3, 2011 by x942 Quote Link to comment Share on other sites More sharing options...
Infiltrator Posted January 3, 2011 Share Posted January 3, 2011 If you want to crack passwords using a cluster, invest into nvidia graphics card, like the GTX 580s. They have over 500 cores, of parallel processing power and they are more efficient than having over 50 standalone computers. And to crack PDF passwords, you will need a distributed password cracker like http://www.elcomsoft.com/edpr.html Quote Link to comment Share on other sites More sharing options...
Inked Posted January 4, 2011 Share Posted January 4, 2011 And to crack PDF passwords, you will need a distributed password cracker like http://www.elcomsoft.com/edpr.html Ditto on this piece of software. I have used it before with success. Quote Link to comment Share on other sites More sharing options...
Mr-Protocol Posted October 15, 2012 Share Posted October 15, 2012 Or free and open source: http://pdfcrack.sourceforge.net/ Quote Link to comment Share on other sites More sharing options...
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