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https://issues.apache.org/jira/browse/PDFBOX-4413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16796474#comment-16796474
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Tilman Hausherr commented on PDFBOX-4413:
-----------------------------------------
Our "R" is 6 since PDFBOX-1594. I remember that when I worked on this issue, I
had a look both at "Adobe supplement to the ISO 32000 Base Version 1.7
extensionLevel 3" and the PDF 2.0 draft (I don't own the final specification)
and it seemed to be the same. My changes in this issue didn't do anything re
the encryption algorithm (all in SecurityHandler.java), only the many things
around it.
> Add support for AES256 encryption for public key
> ------------------------------------------------
>
> Key: PDFBOX-4413
> URL: https://issues.apache.org/jira/browse/PDFBOX-4413
> Project: PDFBox
> Issue Type: Improvement
> Components: Crypto
> Affects Versions: 2.0.13
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> Labels: AES256
> Fix For: 2.0.14, 3.0.0 PDFBox
>
>
> Adobe 9 added support for AES 256 encryption. This should also be implemented
> for public key encryption, currently it is only implemented for symmetric key
> encryption.
> Further information is available at
> [http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/adobe_supplement_iso32000.pdf].
> I suspect that much of it is already available in the base class, but
> PublicKeySecurityHandler.prepareDocumentForEncryption() is definitively old
> stuff.
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