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https://issues.apache.org/jira/browse/PDFBOX-4453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758948#comment-16758948
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Michael Klink commented on PDFBOX-4453:
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[~tilman] -
Another option would be to add another flag to {{COSBase}} which indicates
whether the instance has gone through decryption already.
{{SecurityHandler.decrypt}} could then decide based on that flag whether or not
to decrypt and set that flag after decryption.
If you don't want {{COSBase}} instance data to grow in size, replace the
current `boolean direct` in it by a `byte flags` and set or check different
bits in setters and getters for _direct_ and _decrypted_ respectively.
> Encrypted string not decrypted
> ------------------------------
>
> Key: PDFBOX-4453
> URL: https://issues.apache.org/jira/browse/PDFBOX-4453
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto
> Affects Versions: 2.0.13
> Reporter: Tilman Hausherr
> Priority: Critical
> Fix For: 2.0.14, 3.0.0 PDFBox
>
> Attachments: 2AF-0088-NA-LMF35-40-01-2019-01-18-14-25-52(1).pdf
>
>
> In the attached file, an ancrypted string "0" should be decrypted to "3" but
> it is not.
> * It is RC4 40 bit enrcyption
> * The string is not decrypted because it is skipped because it is in the
> objects HashSet
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