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https://issues.apache.org/jira/browse/PDFBOX-4413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727569#comment-16727569
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Tilman Hausherr commented on PDFBOX-4413:
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The main differences are that the recipients must go into the crypt filter
dictionary when the subfilter adbe.pkcs7.s5 is used (I couldn't get it to run
with the adbe.pkcs7.s4 subfilter, and a working file I created with another
software used adbe.pkcs7.s5), and that the standard crypt filter is now named
/{color:#333333}DefaultCryptFilter{color} for public key encryption instead of
/StdCF symmetric encryption.
> 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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