Debenu Quick PDF Library - PDF SDK Community Forum : PDF AES encryption ? http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 04 May 2026 11:16:06 +0000 Fri, 06 Aug 2010 10:12:39 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=1311 <![CDATA[Debenu Quick PDF Library - PDF SDK Community Forum]]> http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ <![CDATA[PDF AES encryption ? : Hi Guys,Currently, when Quick...]]> http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post6794.html#6794 Author: Rowan
Subject: 1311
Posted: 06 Aug 10 at 10:12AM

Hi Guys,

Currently, when Quick PDF Library encrypts a document all the content is encrypted -- page content, images, file attachments, etc. 

Using the "crypt filters" feature in the PDF specification you can selectively encrypt parts of a PDF. That's useful when you want everything encrypted except for certain things. For example, if you don't encrypt the metadata then search engines will still be able to find things - but the rest of the document will be secure.

Quick PDF Library does not currently support crypt filters.

What Quick PDF Library does currently do is encrypt all string and stream objects in a document. Since image data is stored in a stream object, it will be encrypted. File attachments are also encrypted.

However, objects like numbers are not encrypted - so things like the image width and height will not be protected.

Cheers,
- Rowan.
]]> Fri, 06 Aug 2010 10:12:39 +0000 http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post6794.html#6794 <![CDATA[PDF AES encryption ? : Hello Ingo,Thank you for your...]]> http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post6003.html#6003 Author: lepoutre
Subject: 1311
Posted: 11 Jan 10 at 7:41AM

Hello Ingo,

Thank you for your input. I take it that only the base document is currently encrypted excluding files embedded with addimagefromfile() and embedfile() function.
 
I am certainly no pdf-format guru. But my understanding was that the document was - at least in current versions possibly starting with version 7 - fully encrypted including attachements. That is what I grasped from the text below concerning encryption scope on recent versions. Am I wrong? 

Can we expect more complete AES encryption later this year when debenu starts coding their AES-256 support. I'd be glad to hear that quickpdf-generated documents could behave like Fort Knox once a long enough password is devised:)

http://help.adobe.com/en_US/Acrobat/9.0/Standard/WSD012A4E1-51D1-4bcd-BA9F-EF03C6F20BB6.html

"Encrypt All Document Contents
Select this option to encrypt the document and the documentmetadata. If this option is selected, search engines cannot accessthe document metadata.
Encrypt All Document Contents Except Metadata
Select this option to encrypt the contents of a documentbut still allow search engines access to the document metadata.This option is available when you select a compatibility to Acrobat6.0 and later.
Encrypt Only File Attachments
Select this option to require a password for opening fileattachments. However, users can open the PDF without a password. Usethis setting for security envelopes. This option is available whenyou set compatibility for Acrobat 7.0 and later."

]]> Mon, 11 Jan 2010 07:41:46 +0000 http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post6003.html#6003 <![CDATA[PDF AES encryption ? : Hi!As you can read here:http:/...]]> http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post6002.html#6002 Author: Ingo
Subject: 1311
Posted: 11 Jan 10 at 6:45AM

Hi!

As you can read here:
http://www.quickpdflibrary.com/help/quickpdf/Encrypt.php
It's the text that will be encrypted.
I think that's the normal way and according to the pdf-specs 'cause i've never had problems to decrypt an external aes-pdf-file with images and text?

Cheers, Ingo
]]> Mon, 11 Jan 2010 06:45:05 +0000 http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post6002.html#6002 <![CDATA[PDF AES encryption ? : To be more specific, I want to...]]> http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post5998.html#5998 Author: lepoutre
Subject: 1311
Posted: 10 Jan 10 at 3:01PM

To be more specific, I want to make sure that the images embedded in the pdf (currently jpeg and/or png via AddImageFromFile) are duly encrypted within the PDF file.

My understanding is that these files were  embedded as-is. Has this changed ? Is quickpdf embedding those pieces "as-is" or encrypted? ]]> Sun, 10 Jan 2010 15:01:08 +0000 http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post5998.html#5998 <![CDATA[PDF AES encryption ? : Hi,I have understood that the...]]> http://www.quickpdf.org/forum/pdf-aes-encryption_topic1311_post5997.html#5997 Author: lepoutre
Subject: 1311
Posted: 10 Jan 10 at 2:04PM

Hi,

I have understood that the recent versions of quickpdf enjoyed a "128-bit AES encryption" option. Nice addition.

The older pdf formats -pre 8.x - would encrypt the text base but not images included in the pdf. And I am looking for accross-the-board encryption. I'd like to hear whether the more recent PDF AEAS encryption does incorporate embedded bitmaps.

A very satisfied user of the legacy product and possible commuter to the new product:)


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