Reading encrypted PDF-fileswithoutuser-pa ssword 2006-07-18 - By Humbold, Stefan
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Hello Paulo,
thanks a lot!
Stefan
-- --Urspr?ngliche Nachricht-- --
Von: itext-questions-bounces@(protected)
[mailto:itext-questions-bounces@(protected)] Im Auftrag von Paulo
Soares
Gesendet: Dienstag, 18. Juli 2006 13:31
An: Post all your questions about iText here
Betreff: Re: [iText-questions] Reading encrypted PDF-fileswithoutuser-pa
ssword
It was a bug, the owner key was set to blank. It's fixed in the CVS.
Paulo
> -- --Original Message-- --
> From: itext-questions-bounces@(protected)
> [mailto:itext-questions-bounces@(protected)] On
> Behalf Of Humbold, Stefan
> Sent: Tuesday, July 18, 2006 7:01 AM
> To: 'Post all your questions about iText here'
> Subject: Re: [iText-questions] Reading encrypted
> PDF-fileswithoutuser-pa ssword
>
> yes, of course. I post the pdf-file, user-password is "user"
> (but you can
> also take the pdf-file from the tutorial ...
> http://itextdocs.lowagie.com/tutorial/general/HelloEncrypted.pdf)
> I also post you my simple small demo-program to decrypt the
> pdf-file without
> password.
>
> Stefan
>
>
> -- --Urspr?ngliche Nachricht-- --
> Von: itext-questions-bounces@(protected)
> [mailto:itext-questions-bounces@(protected)] Im
> Auftrag von Paulo
> Soares
> Gesendet: Montag, 17. Juli 2006 16:46
> An: Post all your questions about iText here
> Betreff: Re: [iText-questions] Reading encrypted PDF-files
> withoutuser-pa
> ssword
>
>
> If Acrobat asks for a password, then iText will also need
> one. Can you post
> the PDF?
>
> Paulo
>
> > -- --Original Message-- --
> > From: itext-questions-bounces@(protected)
> > [mailto:itext-questions-bounces@(protected)] On
> > Behalf Of Humbold, Stefan
> > Sent: Monday, July 17, 2006 2:39 PM
> > To: 'Post all your questions about iText here'
> > Subject: Re: [iText-questions] Reading encrypted PDF-files
> > withoutuser-pa ssword
> >
> > just now i recognized, that i can only decrypt the
> encrypted pdf-file
> > without password, if i use PdfWriter.STRENGTH128BITS during
> > encryption.
> > --> PdfReader reader = new PdfReader(pdfEncrypted.pdf);
> >
> > If i use PdfWriter.STRENGTH40BITS, i need the user-password
> > --> PdfReader reader = new PdfReader(pdfEncrypted.pdf,
> > "userPW".getBytes());
> >
> > But i hope, it is not the solution, just to set the encryption to 40
> > bit...
> >
> >
> > -- --Urspr?ngliche Nachricht-- --
> > Von: itext-questions-bounces@(protected)
> > [mailto:itext-questions-bounces@(protected)] Im Auftrag
> > von Paulo Soares
> > Gesendet: Montag, 17. Juli 2006 13:53
> > An: Post all your questions about iText here
> > Betreff: Re: [iText-questions] Reading encrypted PDF-files without
> > user-password
> >
> >
> > If you have a user password it will certainly need the password to
> > open it. What's the behaviour in Acrobat when opening the doc?
> >
> > Paulo
> >
> > > -- --Original Message-- --
> > > From: itext-questions-bounces@(protected)
> > > [mailto:itext-questions-bounces@(protected)] On Behalf
> > > Of stefan humbold
> > > Sent: Monday, July 17, 2006 12:02 PM
> > > To: itext-questions@(protected)
> > > Subject: [iText-questions] Reading encrypted PDF-files
> > > without user-password
> > >
> > > Hello iTexter,
> > >
> > > i want to make encrypted PDF-files with iText (iText v1.4.2, JDK
> > > 1.5.0):
> > >
> > > ...
> > > PdfWriter writer = PdfWriter.getInstance(document, new
> > > FileOutputStream(pdfEncrypted.pdf));
> > > writer.setEncryption(PdfWriter.STRENGTH128BITS,
> > > "userPW", "ownerPW", permissions);
> > > ...
> > >
> > > My user password in this example is "userPW".
> > >
> > > I thougt, that this encryption is secure and that i
> > > need the user-password to read the encrypted pdf-File.
> > >
> > > But now i can open the generated file with iText
> > > without user password.... the user password is simple null!
> > >
> > > ...
> > > PdfReader reader = new PdfReader(pdfEncrypted.pdf);
> > > PdfEncryptor.encrypt(reader, new
> > FileOutputStream(pdfDecrypted.pdf),
> > > null, null, PdfWriter.AllowPrinting, false);
> > > ...
> > >
> > > Now i can save the decrypted file without encryption.
> > >
> > > Even if i take the encrypted pdf-file from the iText -Tutorial, i
> > > don't need a password to open the file with iText... my
> password is
> > > again null.
> > > (http://itextdocs.lowagie.com/tutorial/general/HelloEncrypted.pdf)
> > > I don't know, if this is a bug or a feature?
> > >
> > > But if i take the encrypted pdf-file from itextsharp
> > > (http://itextsharp.sourceforge.net/examples/Chap0110.pdf)
> > > , i get --> java.io.IOException  : Bad user password
> > > This pdf-file seems to be encrypted correct.
> > >
> > > Seems, that the PDF-Files encrypted by java-iText can always be
> > > deyrypted by java-iText. Independent of the giffen
> password during
> > > encryption. Did i make any mistake(s) during encryption?
> > >
> > > Hope for help!
> > > Humbi
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