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https://issues.apache.org/jira/browse/PDFBOX-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14192992#comment-14192992
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Tilman Hausherr commented on PDFBOX-2471:
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See also PDFBOX-2469 which is for decrypting.
> AES encryption failing to write Acroform field names and values
> ---------------------------------------------------------------
>
> Key: PDFBOX-2471
> URL: https://issues.apache.org/jira/browse/PDFBOX-2471
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm, Writing
> Affects Versions: 2.0.0
> Reporter: Stephen Hendrix
> Labels: AES256, AcroForm
> Attachments: PDFBOX-2471_Fix__AES_256_bit_encryption_of_COSString.diff
>
>
> When writing a PDF using AES 256 bit encryption, the field names / values
> from the Acroform are not being persisted correctly. If I encrypt using RC4
> 128 bit, they are persisted correctly. I am using snapshot
> pdfbox:2.0.0-20141023.180319-636.
> I dug into this, and it looks to me the problem is with
> COSWriter.visitFromString, which invokes SecurityHandler.decryptString
> (there is no SecurityHandler.encryptString).
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