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https://issues.apache.org/jira/browse/PDFBOX-4413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727562#comment-16727562
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ASF subversion and git services commented on PDFBOX-4413:
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Commit 1849574 from Tilman Hausherr in branch 'pdfbox/branches/2.0'
[ https://svn.apache.org/r1849574 ]
PDFBOX-4413: support AES256 and AES128 (disabled because it's not working)
> 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
> Priority: Major
>
> 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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